My thought is no because there really aren't that many specific financial threads posted, and given that if there were a forum, half would post on the OT board anyways because that's where the traffic is. So that said, I think it would be pretty quiet there and it would languish amongst few faithfuls.
And regarding stocks, there is a usually a main stock market thread created at the beginning of each year, and people post their stock thoughts etc. in that one. Its better that way for these because all those tracking the market will probably keep in touch with that thread, and discussions will be better with more involved.