Randy, from the FAQ:
In reply to:
Participants may not use the Forums to post or transmit advertisements or commercial solicitations of any kind.
Since this is a "personal" sale, I don't think it is against the rules, but is still frowned upon. The big no-no is when used Axioms are pedaled here. Pretty tacky to say the least.
Personally, until Axiom launches the new receiver, I kind of like when people offer up their electronics. I'm still waiting for someone with a honking power amp who is desperate for cash.