Well tripod did more or less the same 5 years earlier, and had a million copycat sites. What exactly was the great idea that myspace had?
If you read up on myspace history and how they came to dominate the market it is quite obvious that it was by pushing their product relentlessly - not by innovating or having excellent ideas.
Very few scientists are rich, and very few businessmen are good at science.
But if the goal is to make money I would pick good execution over a good idea any day. Just look at myspace ;-)