many tanks for your reply...
but as much I searching and learning online and with your help with answer I can say now that with mining profit is poor and very risky... I will not bother if is slow earnings .. but after all calculation mining become to much risky... will not even bother if is risky and if we can make good ROI ... but you see my point? hight risk/low earnings ... what you thing ??
sorry for my english ..I am not the best

It is well known that mining is risky. And so is Bitcoin. Thus, the same rule applies:
"do not invest more than you can afford to lose"
Everyone has his own expectations about the future and will act accordingly. My sha contract for example was profitable. I have invested recently some money in X11 because prices and hashrate are relatively stable and if this continues I will make a profit, as well.
Also with GM you have the option to mine different coins. By the way it would be great if you guys could add Ethereum, as well!