Oh yeh theres money to be made I wouldnt quit aby job tho just a nice secondary income/hobby, you just leave them running 24/7 rarly do I have touch my rig I connect to it over the internet to check all is good, like anything tho stuff can go wrong your hardware can break being on full wack all the time, you can sell at the wrong time or you could save all your coins anticipating a rise and end up panic selling I recomend anyone with a desktop pc with spare pci port to stick a couple 7950 or 7970s in and make a few quid chances are when youve had enough you will get more money for thw gpu than you paid for it!!