In New York City, famous performance spots abound, and countless bars, clubs, and watering holes can lay claim to having “launched” the career of a superstar or two. But few clubs have the lineage of the Bottom Line, which was recently ordered to close after falling behind in its rent payments to New York University, and few have the social cache of CBGB, which has played host to the cutting edge of the American punk movement for three decades. There are lessons in the contrast between the current fortunes of these two clubs, and the hardest one may be that, all too often, it isn’t enough to be legendary, or even good at what you do. You’ve got to be lucky, too.