I’ll try to explain the best I can, so bear with me. Since I was talking about PSA specifically I’ll drive into them first.
When you grade cards with PSA they have the option to either ship cards back to you or you can vault your cards with them. This vault used to be the eBay vault which has now since been rebranded as the PSA vault. This PSA vault is now the official vault for eBay since Collectors (PSA’s parent company) partnered with eBay.
Due to this partnership PSA now has their own eBay store which allows you to grade your cards with them, store your cards in the PSA vault and you can sell them on eBay through PSA’s store simultaneously without any hassle.
Buyers likewise can purchase cards on eBay from the PSA store and store those cards in the PSA vault which transfers ownership fluidly.
Yes, there’s fees involved in many steps to this which I won’t get into.
In your scenario, if PSA allows a username to be displayed on their website on the population report or through the certification verification page etc then you’re removing eBay and their partnership from this equation. PSA has no interest in helping you find a buyer/seller to do a deal outside of a fee structure as commission is big business for them I would imagine.
PSA allows you to sell through them on eBay which has such a huge reach, that’s one of the best scenarios you could ask for as a seller. This reach eBay has is far superior than what PSA’s website could advertise for you if they were to allow selling directly. Plus not many people would search for cards on their site to begin with. So why would anyone bother? As a buyer, you would just follow the PSA store and save your searches on eBay.
PSA is certainly not a marketplace like eBay or Fanatics Collects and I think you’ve missed out how huge an operation that would be for any company to undertake. Especially when PSA has partnered with eBay to solve all these problems for them. PSA doesn’t have the hassle of shipping cards to buyers, having to resolve disputes and claims of item not received and non paying buyers. They let eBay do all that work for them.
As for Beckett, if they’d allow usernames next to their certs then they’d need to either set up an entire marketplace on their website and a fee structure to make it profitable or just let people do deals behind the scenes on their socials. So it would either be a huge expense for them or a potential headache when someone inevitably gets scammed going through DMs and that wouldn’t even generate a profit, so why bother.
Maybe I’m missing the point here but that’s just how I’m viewing this from a business point of view. As a collector I agree it would certainly make things easier for sure.