Having a good idea is very important to the success of a startup. However, their market value is lessened by the fact that the supply of "good ideas" greatly exceeds the demand. Between the idea, the talent, and the elbow grease, the idea is the least likely of the three to be the bottleneck. An idea is like a computer. It's essential to the success of your project, but they're not that hard to come by, a lot of people have them, and obtaining one is probably the least difficult part of the process. Ideas aren't worthless, but they are worth less.