No I won't sign your NDA, here's why.
Frankly, I am getting tired of this "ideas are worthless, execution is golden" mantra. Of course, "let's build a online shop" idea is useless, but it's not really an idea to begin with. An idea that is worth discussing with others would typically include some minimal validation, an execution and marketing plan and, in general, some amount of thought put into it. Because otherwise it's not an idea, but a random brainfart.Moreover, the value of a good idea is in that extra thought that was put into it, something that is well worth a bit of protection. This is not an abstract MBA point. I am involved with a project that can be fully described in just 4 words, and these are plenty sufficient to tip off the competition and loose the first-to-market advantage. Should we not have been careful with how we talked to other people about the idea, we might've lost it to the established players already.(edit) I am not disagreeing that a lot of people asking for an NDA upfront are lunatics, because they are. It's the black and white take on the value of ideas that I have an issue with.