There isn't a more expensive Mac option to buy if what you're after is a gaming GPU. It's more likely that the VM team sees this as a very low benefit ticket to pursue given the tiny segment of Mac gamers hoping to improve their options with a Linux VM for gaming.

(Meanwhile, I'm recompiling Wine to see if I can patch it to address an issue that was hotfixed in Proton two weeks ago but isn't in a CrossOver build yet, so yeah, there's maybe some arguments to be made here that I'd be a potential beneficiary. If I weren't too cheap to spring for an eGPU in today's market, anyway.)