Be aware that the shipping thing still applies with the Axiom auction site. Shipping is between the seller and the buyer; Axiom doesn't get into it.
I didn't have a problem with this with my buyer (he just paypal'd me the money after I sent him the estimates, then I printed the labels, bam), but...
We talked about this issue on the last conference call, and Axiom's thinking about how to at least document it better.
I didn't do it, no one saw me, you can't prove anything.