I guess if people use eBay a lot to sell used games then there is something of an overlap there. Otherwise, it seems pretty weird.
If I understand correctly, I think the collectibles market is more in line with what GameStop is looking at here. They recently got into the trading card game including grading services via PSA.
That sneaker company that pivoted to data centers set the 'weird' bar pretty high.
GameStop has physical stores so could be a place to send, collect from or even verify high value eBay items.