> While probably harder to find a no-questions asked buyer, the price premium on GPUs is a lot higher than some consoles.
I'd go further than that. A no-questions-asked buyer for a console merely suspects there's shenanigans afoot, and will expect a considerable discount off the sticker price. A no-questions-asked buyer for server GPUs almost certainly knows for a fact there's shenanigans afoot, but is likely to pay a premium over the sticker price anyway.
Another reason why they are cheap is because Xbox will ban the consoles once they know they were stolen. GPUs on the other hand don't have a remote kill switch after being stolen.