buckworks - 4:09 pm on May 31, 2010 (gmt 0)
Is there a way you could set up some small scale testing? Sometimes real-life user response can show very quickly whether The Bright Idea will be a winner or a dud.
HOW is it going to make any money (and how much- will it ever be profitable?
I think that issue is the one to zero in on. If there is a solid business case for the idea, the other questions are supporting details. If there's not a clear business case, the client needs to be clear that it's experimental.
In either case, the responsibility lies with the client and your mission will be to execute with excellence. Top-notch execution can sometimes turn a second-rate idea into a first-rate profit center.