Why spend $ at Bars/Nightclubs in our Current Economic State?

I don't get it. On average, an individual spends anywhere from $25 to $50 each time they go out to a bar or nightclub. Now if the average gay male goes out 2 times a week thats $50 to $100 that they most likely don't have to spend. Or that comes out of something else that is much more important, like rent.
So again, I ask ya why does one do this to themselves.