Ignoring the lies, contradictions, behaviour and general seediness of Gainbitcoin and its operatives, the bottom line here is... "Will I make a profit if I give Gainbitcoin money?"
According to them, you will be paid back ~10% a month of the money you give them in the first place. So, for ten months, they are giving you your "investment" back in installments. After ten months you are back where you started.
As their contracts are 18 months, then a further 8 x 10% is your profit.
(If they still exist, haven't been "hacked" or unilaterally cancel your contract [see Genesis, Bitclub etc.].......18 months is an aeon in
BTC)
Let us accept, for the purpose of this exercise, that they mine with S9's.
Also, for simplicity's sake, let us say that those S9's hash at 12.5 Th/s, so when you buy an "Amaze A5" (25 Th/s) package you effectively lease the output of two S9's for eighteen months.
This will cost you 13.75
BTC, $8250 at $600 exchange.
According to Gain's figures, at the end of your 547 day contract you will have received 18 x 10% x $8250 = $14,850.A net profit of $6,600
Back in the real world, let's use Coinwarz calculator
{1}.
I have reduced the power consumption pro rata 0.098 J/Gh to 2450 watts for 25 Th/s of S9.
I have put pool fees to zero.
I have used $0.06 for electricity. It looks like they are banditting electricity in their videos, so let's make this a general overhead figure. (Way too small).
With these highly optimistic cost figures* (in Gain's favor), what do we get?
Days to break even, 681.36.
According to Coinwarz's figures, at the end of your 547 day contract you will have received 547 x $12.11 = $6624.A net loss of $1626
Who do you believe, Bhardwaj/Kumar or Coinwarz?
Hmmm.....
*Costs. The $0.06 Kwh I used is deliberately derisory as an overall cost of operation. Also to take into account before the gross S9 revenue gets to your account are:
Capital cost of equipment
Maintenance of provenly unreliable S9's and subsequent down time
On site wages
Bribes
Mark Lee
Flights for the family
Indian based infrastructure
Kartik Kanwar's suits
MLM Referral commission structure (can reach 30% of gross revenue), including rake off for Ver(manen) and Guzda (YT vid) to throw away into FutureNet
{1}
Coinwarz does not attempt to predict difficulty increase. As difficulty increases, rewards will drop.
In the last year, Bitcoin mining difficulty has increased by a factor of ~5.
Should the next eighteen months continue this trend (and why should it not?) but only double, then rewards will be cut by 2/3.
The moral of this story is: Do not buy cloudmining contracts under any circumstances, especially when the seller lies thru his teeth about ROI.