In one case, the start-up spent $300,000 to host a video from pop singer Alicia Keys that managers claimed would draw 1 million new users. But without any of he

In one case, the start-up spent $300,000 to host a video from pop singer Alicia Keys that managers claimed would draw 1 million new users. But without any of her hit songs in the clip, only 5,000 visitors showed up. Ouch.