The conversation you had could easily have been had via PM.
Just put a post up on the thread saying - you have PM.. then continue your conversation in PM's.
In your case you clearly weren't just bumping the thread to the top for a mate, but if the mods allowed you to do it then it's something that could be abused by those wanting to bump threads to the top for their mates. So they have to have a harsh blanket ruling.
It's not a case of being keyboard warriors, it's just a case of the mods trying to stop the sales section on the BBS descending into anarchy. It's a very busy sales section on there.
I've been a member on there for over 10 years, never had a single problem.