I run a Karaoke in the local bar every other week with the son of the owner working the opposite week, this village only as a population of 350. I use their equipment it's already set up and I get $100 plus the drinks for my wife and I all night, I only have a few beers at the end of the show, but my wife makes up for it, so you could say that I get about $130 / night.
I also have my own equipment and when I do a private show I charge between $250 - $350 depending on the amount of people.
I do it because I enjoy seeing people having a good time, and no matter what the level of singer they are I always try to make they feel like a star, after all it take a lot of gut's for some people to get up in front of a crowd of people and belt out a song. I call my company Funtime Karaoke because thats what it's all about.
