Sometimes you want to DO something about these scammers!

[nat]

Man someone who bids on that thing missed a lot of warning signs.

It's a good question, whether it's in ebay's long term interest to stop this nonsense. If the supply of suckers is large enough, then even in the long run maybe they'll make more money off of the scammers than they would from legitimate sales (which, I assume, get pushed, to some extent at least, to other platforms).

Definitely don't send scammers harassing messages. But you could send them helpful ones: "Hi, I'm interested in Babe Ruth autographs and noticed your listing. It would be a nice piece, but I'm afraid that somebody ripped you off, as I'm pretty sure that the one that you're selling isn't original. In an abundance of caution, I'll pass word along to eBay. They're probably best equipped to ensure that it's authentic." Something like that.