Tumbleranting
Seth Godin is a nicer guy than I am (he's probably better dressed, too): I would have ballparked his quote a little higher. Explanation: there's a "don't waste my time" fee.
As a freelancer, this happens to me all the time and it's muy frustrating. I like hearing ideas, I like helping you structure your approach, I love developing solutions, applications, tools for you. I don't even mind giving estimates and free advice. But in order to do that, you need to tell me what it is you want.
And no, "just like digg but with/for xxx" isn't what I'm talking about :-).