I think there are a lot of good points here.
Unfortunately there are a lot of people who like to window shop. Make multiple appointments and just try to find the best one.
If it's B&S or somehow misrepresented, or some legitimate reason I think this is completely understandable to walk.
However, if the photos are real and accurate, and you decide to walk and want to see other girls etc... It's just something we don't allow.
When you make an appointment, that spot is reserved for you. But if you are going to flake for literally no reason, then it's just wasting everyone's time and effort and impacting the girls income.
In short, just be respectful of everyone involved. There are those who take advantage of this tactic, in which case your next request for an appointment my go unanswered. We actively limit the maximum amount of rejects in a clients life cycle, if it's blatantly just wasting our time we may just limit it to one. It's not fair for legitimate clients who are looking to schedule an appointment.
Unfortunately frustration in this business sometimes goes both ways. There are fake ads and bad SPs and there are also clients who try to game the system.
Again I'm only commenting on the situation where it's as advertised, not B&S or heavy Photoshop etc. If someone is misrepresenting themselves then they should know to expect this sort of outcome.
In short, be reasonable and respectful.