For will-call tickets, if at any point someone wants to sell their ticket they simply log into their online burning man account and click "post for sale", or if that's too complicated, submit their confirmation number and buyer info into a page similar to the current ticket name change form at https://secure.inticketing.com/namechange.php?nug=burn . Tickets will be sold on the Burning Man website and refunded in the order they're posted, with no need for buyers to contact individual sellers. Any tickets not resold will remain available as will-call to the original owners. This could be fairly automatic.
For people that insist on physical tickets, if they choose to resell them they can mail them back to the Burning Man organization along with $50 upfront (or whatever amount makes sense to the Burning Man organizers) as a non refundable processing fee and incentive to stick to e-tickets. They will then be treated the same as will-call/e-tickets, sold in the order they're posted, and will remain usable as will-call tickets to the original owner if they don't sell.
