Of course, the flipside is maybe more dangerous. "Hey, this sounds like a really stupid idea... then again, I thought pinterest sounded stupid too, and look how that turned out. Ok dubious business opportunity, here's my time/money!"

I'm being facetious of course, but the best deals are often the ones you don't make. The real question is how much of an impact an anomalous success story should have on the way you evaluate business opportunities.