I'm in Canada, the cheapest 1070 on ebay will cost me only 50$ less than a full PS5 Digital edition.... I'm not about to find the rest of the machine for 50$ (like $30USD). Local Facebook marketplace etc. are as bad, if not worse.
That potato masher discussion is absurd at the moment, if you get a PC it's because you want to game on PC (KB + mouse, RTS, possibility to configure games and mods).
Sometimes they are still about the same price in eBay, on completed auctions, add shipping and this is embarrassing, especially compared to a PS5 digital edition--which is 400$... find that CPU/RAM/PSU/case/RAM/storage for 20$ all included and come back to me, I'll built the machine myself just for kicks.