[paulhauggis]

"By asking me not to disclose your idea, the client gives me the impression of someone undervaluing the execution part."

This isn't my impression at all. Execution is the most important part. If you discuss the idea with someone who happens to have more resources than you do, they can execute the idea faster than you and possibly hurt your chances at gaining traction.

The funny thing is, I've done just this. People have discussed their ideas on forums and I beat them to the punch and made money. This is why I know it's important to keep your idea a secret until you are very close to launching (so your competitors have at least a couple of months before they could come out with your idea).

You don't really care because you are just the coder. You will get paid whether the app is a success or a failure. So it's you that isn't really taking the business aspect into consideration.