And I think we should all be mindful that even though these girls do voluntarily sign up on SA, there's still the potential for harm.  My personal philosophy is to have fun while doing no harm.  Or to put it in more positive terms, I always follow Dan Savage's "Campfire Rule" which is to leave your lover in better condition than when you found her.  Most of the SBs I've dated have been so enthusiastic about the bedroom activities that I had no doubt it was a win/win situation for them; lots of pleasure and some money as icing on the cake! But I've had one or two where I was not so certain.  One I'm thinking of who is nearly impossible to engage in conversation, makes little eye contact, is somewhat mechanical in bed, and never Os.  She swears she's having a good time, and she continues to ask me for dates.  But I can't help thinking maybe she really hates doing this except for the money.  If I can't resolve this question I'll have to quit seeing her.  I don't want to participate if I fear she's only willing due to financial necessity.  It's still consensual adult activity, not coercion,  but it does not meet my personal ethical standards of behavior.

and the relationship is not one where the client has control over the provider (As in being her boss, teacher, welfare case worker, etc.), then there is no exploitation.

 
Weinstein and his ilk take advantage of their power over their victims to exploit them when they most likely had no intention of having any sexual relationship with the person in the first place.

Interesting question.  I like all of the responses, here is my humble take.  

We are not controlling the young ladies careers, simply offering financial help on a short term, case by case situation.  Either party can walk away at anytime.  HW had control to the actresses livelyhood and was in s position to not grant them the work.  

Regarding whether they are enjoying the time with a older guy.  I can say I’ve had one decide she couldn’t go on because she felt like a sex toy.  She perpetuatuated that by telling me she was submissive and wanted to be told what to do. Regardless I fell if the SB had any issues with the game then it’s over no issues.  I also have one in rotation that wants to be tied, blindfolded, and silenced. She says it’s good for her. I’m confused by that but I’ll soilder on.  

Our moral issues?  Well we have to deal with that don’t we?  I wonder if I’m a sex addict by not being happy with the sex I get at home and always wanting more.  I know I wrestle with my morals, I won’t presume anyone else does.  

I will keep getting my poon on.  I have a new one that caught my eye.  Shiny objects!!

I agree with the general sentiments expressed above. The sugar bowl dynamic is about adults mutually consenting to engage in sexual and other activities. While for HW, he  and other very powerful (and lets face it, less powerful) men in virtually every industry have been using their power to coerce or force women into compromising themselves as long as there has been hierarchical systems in society.  This is the very definition of "quid pro quo" that has driven much of the sexual harassment legislation and case law in US and other Western countries over the last 40+ years.  
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The only moral issues (with one exception noted below) that SD's must wrestle with are the same as the moral issues they encounter in traditional mongering: Relationship fidelity, p4p/NSA vs."traditional relationships", religious prohibitions, and legal prohibitions.  If you're OK with banging a pro, you're probably ok with banging an SB.  For me, I'm not in a relationship, don't need to love someone to fuck her, not religious, and strongly oppose criminalization of p4p sex.  There may be an argument that as "wealthy" men we are de facto in a position of power. But we don't use that power to damage, deny, destroy, or prevent our SB's from being successful. There is no "do this or I will take some adverse action against you" aspect.  Note the US laws on "quid pro quo" also cite examples where failing to "do this" results in "not doing some positive action" as well.  But that typically includes the existence of some additional hierarchical relationship (manager/employee, producer/actress, vendor/customer, etc.) as well. This typically does not exist in the sugar bowl, unless you are stupid enough to actually hire your SB at your company.  
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The I alluded to above comes in the form of SB's who might be being exploited by others to enter the sugar bowl. We often talk about SB's who are semi-pros or pros on the DL.  But there are also a (fairly small) number of SB's who could be forced or coerced into SB status by a pimp, BF, drug dealer, etc.  I do think it is our responsibility to watch for the warning signs of this make sure we are not unwittingly facilitating this situation.  Again, this is a parallel to the traditional monger world. But it may be hard to spot when we just assume the 20-ish hottie is just out for old guy cock and some Benjamins for fun.  I am typically leery of SB's in "open relationships" and who seem to focus on getting BCD pay ASAP to the exclusion of all other interactions.  My Spidey Senses get all tingly when on top of these, she only has a burner phone, no permanent residence, and is using fake pics (usually published pics of modes or celebs). When encountered, or just highly suspicious, I decline.  

I can't help but mix some pinch of paternalism into the lust I feel for these young women.  

Yes, they're "adults", but the ones I'm seeing who are 18-22 are SO YOUNG. If I decide to go BCD with them (or if I don't decide to) I can't help but dispense some friendly advice, like (1) have a girlfriend to check in with when you see/meet a new guy, (2) use the fucking condoms (I've never, EVER been offered BBFS from providers, and it is COMMON with SBs!), (3) don't throw caution out the window because the guy "seems nice" or you're following "intuition".

Sweetman's citing of Dan Savage is on point. These interactions are transient and transactional, but that doesn't mean they need to be one-sided or predatory. I'll pursue my own needs/interests dealing the SBs, because they're doing the same, but there are lines I won't cross. As Sweetman says, they should be left better off for their encounter(s) with you and they shouldn't look back years later and feel exploited.

And one last thought, I like to think that in decades to come these sweet young things will look back on their encounters with me and think, wow I really was lucky to meet such a nice guy at that stage of my life, rather than think something negative or regretful. I want to become a pleasant chapter, or at least paragraph, in their memoirs.  That goal helps guide my behavior towards them.

Agree with Sweetman.  I want to be a fond moment(s) in my SB’s lives.  When they want to end I’m ok with it.  I hope I can keep them going for months on end.  No pressure, keeping it positive.  

I’ve learned so far to ask them not to lie to me.  If we can be honest with each other it’s better.