Plenty of stuff on EBay offers me 2 day shipping clearly via fulfillment centers, as far as I'm concerned that's all that matters. Do you think the addition of GameStop stores would mean EBay can offer faster shipping than that on a significant number of items?
What do you think people need to visit fulfillment centers to do?
Sellers...?
If you're saying sellers could come into a GameStop to have their individual items packed and shipped out, I suppose, but:
1. They don't really have the space for much shipping volume at any of their stores.
2. You can walk into any USPS, UPS, FedEx, etc. store and do that already, you don't need an 'EBay' store. GameStop would presumably get the packages picked up by one of those carriers so it's not saving any shipping time or expense.
For buyers, in many cases there's already alternative drop-off locations similar to GameStop Ex. For UPS deliveries I can get them shipped to a bunch of different convenience stores near me. GameStop stores might be a nice addition to that list but it's not enabling something you couldn't do before, and I would think for most people they already have a closer location than a GameStop.
Or, you can bring your cards into Gamestop, and they'll send them off to get them graded and/or buy them from you, at which point they become inventory for their lootbox. With eBay, you'd be able to do all of that, too, except you'd be selling directly to someone else through a consignment service - more pricing freedom.
And then you could start doing it with things other than cards.