Before condos in Williamsburg started selling at a loss and weekend flights to L.A. dropped to under $200, New York's cocaine dealers were supplying good times to people who indulged like the party wouldn't end. Before the recession, "I was making deliveries every night of the week," ... "Back then, I could afford to pick and choose. If I didn't know the address — forget it. If I didn't like their accent — forget it. On most nights, there were more people wanting than I could get to." Then the stock market crashed, and people started losing Sammy’s number. But...