I generally avoid signing NDAs simply to hear or see a pitch/concept/prototype/etc. The real question is "what are you gaining and giving up?" Most entreprene

I generally avoid signing NDAs simply to hear or see a pitch/concept/prototype/etc. The real question is "what are you gaining and giving up?" Most entrepreneurs that I talk to are filled with their own concepts and ideas (and the hard part is usually the execution). Thus, entrepreneurs will often avoid signing NDAs in order to preserve their legal purity in the event that they independently develop a similar product. This is, I believe, the reason why ycombinator and most other large investment firms will not sign NDAs.