For me its right on the border of break even, but Gridcoin price intermitently pumps and if you hold and sell on the highs, then it really is profitable.
For me, I just take the BTC, wait for GRC to drop back and then just buy an even bigger stake.
Because Gridcoin is run by people who are passionate about science, I believe it will last much longer than a lot of alts that are just a way to gamble on the crypto-exchanges.