As I said in a previous post, There is a chance that MC gets to spend time with other strippers as well. No where in the game is it explicitly said that Madame is the Only stripper that you can get to spend time with.
See, There is a possibility that We can still fuck other strippers and I will favor this statement.
The VIP pass is for a whole year, and you get to fuck strippers which is basically not allowed in the club. I think that this is enough that at least we get to have sex with them, considering that we don't meet them anywhere else in the story.
And the money is not at all an issue. The issue is the service we are getting for those prices and the girl who is offering them. If it was Nicole or Sandy, or any other stripper aside from Madame and the services were far more superior, I would have spent that amount of money without any hesitation.