Was at this great club two...

Was at this great club two weeks ago on a week night. It could be hit and miss as the ratio of hot/not was very low for the standards of the Bullet. However, a bad night at the Bullet beats a great night in Chicago. The stool dances were $10/song, however, it seems that a little extra were always appreciated. Does anyone have an idea how much is a fair tip for each dance? Thanks.