Do certain band's fans tip better than others? Sasha Frere-Jones does an uncontrolled study at Bowery Ballroom -- and Chromeo fans, you're busted.“When Chromeo played, their crowd drank house vodka and Budweiser. Didn’t tip. Some of them did what I’ll call the slide-backs. They put a dollar down on the bar, wait until you turn your back, then palm their buck and walk away. Classy. When your night starts out with “What’s your cheapest drink?”......