[drcube]

Even if the idea were worth money, how would you know unless you had experience in the field?

Might as well tell a lawyer your great idea for his client's defense. See how much he'll pay.

As an electrical engineer, I would not presume to understand architecture enough to sell an architect on my lucrative new idea for a building. The architect has probably thought of and dismissed hundreds of ideas like mine.

In the same way, I would never walk up to a web developer and say "Hey, I have this wild original idea about a website! If you build it, we could make tons of money, and I'll even give you half! But you have to sign this NDA before I tell you..."

If you don't know how to implement the idea yourself, chances are it has been though of and rejected already by those who do.