so... at the moment mining is very low profit, you think that something can change with GPU Mining in the near future? or we have to continue like this?
After ASIC took over Scrypt mining, GPU mining quickly became UNprofitable on ANY coin unless you had very low electric costs - and marginal even then.
The next few months is probably going to be a slow slide into that range - I don't see ANY reason for ZEC pricing to ever climb as more than a "pump and dump" spike, ETH has too many issues to see a serious climb before they go POS, and I don't see any fundamental reason for any other Altcoin to make any significant price climb for the medium term, much less the long term.
NVidia isn't significantly better on the CURRENT miners to AMD on either a hash/watt or a hash/$ basis - still looses by a little on hash/$ and you have to lock yourself into NiceHash to even manage "close" right now.
280/280x/290/290x and 3xx equivilents will go unprofitable at pretty much the same time - they all show VERY close numbers on hash/watt.
At CURRENT numbers, NVidia 10xx and AMD RX rigs should stay profitable 'till almost exactly the same point - but future miner upgrades will possibly change that, and it depends on the coin as well - though basket balancing will keep the profitability close on all of the currently mineable coins 'till ETH goes POS, then it'll be a scramble for a bit then a new much lower profitability balance will happen.
Anyone talking about a 2 month ROI though is either insane, or (more likely) COUNTING on selling off the used rigs or at least the GPUs from them to achieve ROI once they're done mining on them.
Keep in mind though - a rig that is sellable as a GAMING rig needs a good CPU in it - something most mining rigs don't bother with.
A good gaming rig also needs a bigger HD/SSD (FORGET about using a USB pen drive on a GAMING rig) and more RAM than most mining rigs bother with, but mining rigs TEND to be closer on those factors.
Gaming rigs also need cases - many or most mining rigs don't bother, but that's not all that hard to "fix".