I don't think there's a direct correlation between a good idea and or interest in pursuing it. The idea may simply not cross the threshold of what you want to send time on.

This also may be one of those things that's not a billion dollar idea, or a million dollar idea, but just a 'couple of thousand dollars' idea. Some people aren't willing to spend time on things that don't cross that money threshold, but others most be willing to do it.