I could see a synergy. Remember when there was a small trend of strip-mall "We'll sell on eBay for you" shops?

That seemed like a great idea for certain types of goods-- the market for plenty of collectibles are thin in any given locality, but it was always clumsy to get to the global marketplace. If you had a normal consumer eBay account with 30 feedback, you might have a hard time getting trust against sellers with 400,000. You had to deal with packing, shipping, nonpayment, complaints.

Handing it all off to a professional with experience and a high volume credible account was worth a consignment commission. But they seemed to dry up after a while, I think when eBay pivoted from "the world's garage sale" to "AliExpress but some products are in domestic warehouses."

If you had a widely deployed retail presence that was already used to dealing with used merchandise (pawnshop-style laws, routing items for cleaning/refubrishment etc), turning the tradein counter into a consignment counter is a potential win. New revenue stream, gets people in the door, and provides an expectation of legitimacy and predictability.