This sounds really good. The only issue I can think of is that most people selling equipment will want to apply the Axiom Dollars to the purchase of the new speakers they bought a week *before* selling the old ones...
The obvious solution is to "suck it up" and survive a few weeks without speakers (between selling the old and receiving the new), but I think most people here would rather donate a kidney or something instead
Questions aside, thank you very much for setting this up.