I've been on both sides of the fence where someone tells me their "super secret" idea and the reality is that it blows...and where I thought that an idea that I had was badass, but when I finally told people, it turned out to be terrible. Even with the ideas that were good, it has taken a long time to develop them. Even if you have a great idea, you still need to get off your ass and execute branding, marketing and product development. Usually, telling people actually helps me talk through the idea and make it better.
I found that ideas are pretty worthless until they are made real. That is the hard part I struggle with. Because implementation requires time, knowledge, and wealth. Something all in short supply.