I dont know about its price, but with 3000$ I could get about 9 x RX580. So basically a RX 580 could achieve 30.4 Mh/s on ETH mining, so 9 x RX580 could hash about 274 Mh/s which is much more than just 80 Mh/s. Actually we should take into account electric price, but it's not the big deal when compare with this Nvidia Titan V Volta.