Yes, that´s a reasonable question. It is a temporary solution. Right now ETH/BTC rate is relatively high - 0,076, so I "exchange" it right away for BTC.
High would be 0.7 eth to 1 btc, eth is at least 350% undervalued, eth's real value x btc is 0.3 right now.
) - 0,075. In December 2017 it was even under 0,03 so that´s why currently I am mining on nicehash.