There was a small window of about 2 weeks where it was possible to make a tidy profit but it all flopped very quickly after that.
The only way I can see it paying off is if you farm 24/7 and then wait till they hit a high again if they ever do.
You should take a look here:-
http://dustcoin.com/
Use the calculations at the bottom to work out your profit after power usage.
I am making £1000 a month tax free from mining litecoin and am loading up on Worldcoin too, hoping to mine a few thousand under my belt and then hope for them to one day hopefully hit $1 or more. If you dabble in the currencies and say sell on highs and mine on lows like people have being doing with Dogecoin its actually possible to double/triple the above if your willing to put the time in.
Its a reality, one which is catching on, values in a year could sky rocket or become worthless, but if you sell monthly there is profits to be made, some very good profits if you trade the different coins.
Hang onto them you could make a fortune or making nothing.
So its profitable right now, even with things not at recent highs.
At the end of the day I can still sell the hardware should I decide to stop mining, but right now there are plenty of people out there making lots of money from this game and all tax free.
So far I am over £1000 in profit, hopefully by the end of the year that will be over 10k, one can hope, and if values sky rocket hey I could get lucky like my mate and bag over 100k from this mining lark.