This really is apples to oranges. First of all, you're talking about a single, point of sale relationship when you go into a retail store. This isn't the same kind of relationship you would have with a business providing a service. That said, if the questions you have are similar in nature to what was outlined in the OP, then a sales associate isn't going to be able to help you.
But if you are a member of a gym, and have questions about the structure of the gym, promotion criteria (if they have any), etc, you're paying for a service. The gym owner is working for you.
To be clear, the business may give zero squats about your business, and so you may not get what you ask for. But it would at least give you a good indication that you should take your money elsewhere. Outside of legal advocacy, it's really up to you to demand the quality of service you expect.