the only place I can say that to a woman I haven't met and get a smile instead of a slap or a middle finger.  Lol

I think they both run into issues and run into a current dynamic her on TER, or probably any review site.

 
Over promise under deliver will probably get more appointments at the start. But few will then become repeat customers.
Under promise is going result in many more repeat customers but fewer initial appointment.

 
In the second case one might word of mouth will help drive additional traffic to your door. But word of mouth here is reviews. The over promise, under deliver will get even worse review scores and a bad reputation, perhaps worse than actually deserved but people do get upset when they feel misled. But it's not symmetrical. When someone writes a glowing review because their expectations were exceeded many here seem to look at the ad and then say the review is a shill so believe the ad rather than the review.

 
So while the under promise over deliver might still work for repeats I'm not sure the approach actually results in more overall business, at least not quickly. I would say the alternative approach, over promise under deliver, will kill repeat business potential. I'm not sure it damages business that much (except in the extreme) as so much here is one-and-done type business it seem and may will take a chance on a new face for the excitement.

Since it is capitalized, which would be an unlikely typing mistake, I attribute this to auto-complete.

whether they are over or under sixty-five.  

Mediocre..no copay.

No copay for mediocre.