Genesis mining

The pressing question of today, from an inexperienced user, with an appeal to the great fathers of this not an easy matter.

Just recently I heard about the principle of such mining, this idea was immediately scared off when I learned about the schemes of scammers.
Yes, there are honest offices that share their capacities and get their coins on the way out.

But, leasing the very minimum of 1Mh / s for a period of 24 months, the expediency of the BTC cannibal falls off at such a power and it is unlikely that anyone will, there remains the hope of the DASH, ETH and others.

I took for example ETH, one unit will give about 0.0015 ETH per day, and with the rate for today $ 224.4 it will be $ 0.33, that is, payback for 90 days - 3 months. And just 21 months of mining is your income after investing.

It is clear that the course is walking, today is $ 224, and tomorrow $ 50 is possible, and when some analysts promise that there will be $ 500.
Nobody will give a guarantee that it is in 90 days I will pay back the invested money, maybe it will be in 500 days.
If I'm wrong in the calculations, please correct.

And now I have a question for the experts of this case, is such a passive income real?
I certainly understand that in the future I will have to buy power, I think once a month.
I would be grateful if anyone would tell about their experience, successful or unsuccessful, and advise a reliable miner whose conscience does not allow to throw their investors)