I personally know someone who was writing a thriller about "the Jesus bloodline" just before Dan Brown. (In retrospect, I think that author had more respect for historical facts, but he wasn't so adept at writing a page-turner.)
Ideas are worthless. Unless you find sucker to sign the cheque. Er i mean... Unless you make them happen.
Fact.
I too had the idea of building a catalogue of available coeds at my university, and yet, I am not a billionaire.
(Zuck stole my luck!)