Business people don't understand forums and are not good with computer. :)

But seriously, business people spend a lot more time talking to people in real-life instead of communicating online. They probably tend to be extroverts, and the silent-light-box method of communicating is just not for them. I really don't think you're going to find anything of decent quality. At best, you're going to find a "successful introverted businessman" forum... which would actually be really interesting.