I get at least one of those a week, and they are so obvious...they want to pay you what you're asking (a few time it was more) without any questions. I hate to be harsh but some of these people ask for it, they must not be aware of P.T. Barnum. I always reply with a brief note saying I only accept cash and telling them they might enjoy this link;
http://j-walk.com/other/conf
which I posted previously in the thread "earn big money"