It seems like it is.

According [1] a 1080 Ti can produce about 675 hashes a second for Zcash. Using [2] we can see that one card would net him about $2.5 per day. For six cards we get ~$450 per month which is enough to pay his electricity bill and probably internet costs.

The graphic cards are quite costly and the payback time for the card thus pretty long.

[1] http://zcashbenchmarks.info/ [2] https://www.cryptocompare.com/mining/calculator/zec?HashingP...