Thank you for asking Silverseeds. I wasn't ignoring you; I was out for a few days.
I have faith in your good judgment and character, and that of everybody who posts whom I know personally. The problem would be potential for liability (as in, MY liability) and loss of reputation. If there is truly strong demand for sales and trades (giveaways, etc), I would at the least need to post some at-your-own-risk disclaimers, add something to the terms of use, and get everybody to agree to the change of the terms-of-use (hmm, that could be daunting).