It was just a suggestion and it's your forum, so do things however you like. But remember, you did ask for feedback. I will add that the most active plant and animal forums (I am a member of) have very active sale/trade/free sections. I'm just offering ideas to help the ant plant forum grow and thrive. I think that's what we all want.
I'm on several plant and animal forums and I like the ability for people to post replies. This avoids having to repeat the same response to questions over and over again. However, a rule to keep negotiations restricted to a private message could be in affect.