How is it even possible to spend $500 in one night at a club? That's 50 drinks, at least!
If you would want to, you could probably spend double that and not even get drunk, by e.g. booking a table or w/e...
Whether it is rational/reasonable to do that is something I cannot answer generally (obviously) but to me it is not. However, as such things exist they have to be reasonable enough to some one, as they are being used.