You can't mine on PS4 console it's still impossible right now, I'm guessing those miners are scalpers too, they must have bought those PS4 at cheaper rate and selling just like other scalpers as well, don't believe everything you read online
They weren't scalping them. The second link I posted is a Ukraine government site with pictures of the Farm with PS4's in rows of racks for mining or possibly farming credits.
They also had 500 plus graphics cards and the processors needed to run them.
Wish the Ukraine's would give us more details.