Yeah but you need to understand gpus prices are not like used to be, gtx 1070 used to be sold for $349, now $499. Yeah, if you buy a 3070 today for $499 and then gpus prices increase once again to a 4070 $699 then yes you will have a resale value better than when you bought and that will hold but pay attention that $349 you paid in 2016 is today $499, inflation and other things.