OP must've dropped outta school...supply and demand, free enterprise, etc.
toilet paper is not as alluring as pussy but when you sit on the shitter and you are out you would pay top $ for it. Same as pussy...when you are horny you will pay top $ but most of us plan out in advance before the little head takes over. IJS.
Girls charge whatever the hell they want. If your product is good what is going on in the market will not affect you at all. That 40 dollar special in a sketch part of town may be all they dude can afford comfortably. If he's happy with it and she is happy with it then awesome. Now if he's bitching because she "wasn't into it" and "she didn't look like pics" he can gtfo for bargain shopping and getting disappointed. Same goes for females....if YOU think you aren't getting paid what you are worth raise your prices. If you are A-OK with just getting a bill paid from time to time don't let someone tell you to how to run your business.
In other words....mind your own business and let other girls mind theirs.