Currently it's profitable for 1 TH/s you pay 0.28$/day in fees but you mine at current prices and difficulty 1.26$/day. This is equivalent to a 22% pool fee.

Revenue in one year you would make about 0.08 BTC at current difficulty and price, if difficulty doubles, wich will do and price too you would make about 0.04-0.06 BTC.

To buy 1 TH/s from GM you would invest like 150$ (small contracts) or more like 130$ (big contracts) so at current prices: 0,035 BTC/TH/s

Return (supose contract discontinued after 1 year):

- Scenary cataclistic: You generate only half bitcions that invested because mining is discontinued before end of year: (0,017BTC/0,035BTC) -1 = -61% in bitcoins

- Scenary pesimist (high diff/price): return = (0,04BTC/0,035BTC) -1 = 14% in bitcoins.

- Scenary optimist (low increase in diff/price):  return = (0,06BTC/0,035BTC) -1 = 71% in bitcoins.

Assume equal probability of 3 scenarios the spected return in bitcoins: 8% in bitcoins.

Not bad you are buying bitcoins at 8% discount.

Reinvesting can change everithing because you go reducing your mean adquisition cost...

This means that the block contains some SEGWIT transactions, as I have understood we could see blocks of 4 MB if all transactions were SEGWIT.

In the following I will make all calculations for 1 TH/s of bitcoin contract, every contract should be proportional to this and the conclusions aplicable to any hashrate.

The ROI nominated in bitcoins in Genesis mining depends on the following factors;
1. Company should continue paying.
2. Price of adquisition of the contract (price varies per hashrate because a discount in high hashrates, 3% discount codes and referral programs). I assume a contract price of 135.8 $ for 1 TH/s.
3. Fee size nominated in dollars. I assume 0.28$ for 1 TH/s
4. Difficulty grow rate. I assume 5.7% every 2 weeks (1 dif period).
5. Bitcoin price increase per difficulty period. This is my variable.
6. Initial mining factor (bitcoins mined before cost) I assume 0.8$/day in bitcoins at the current bitcoin price.

If you have the bad luck of early bitcoin decrease in price or big increase in difficulty you face big lose in Bitcoins because the contract stops, but if the increase in difficulty and price is steady you can lose little or maybe have some ROI.

I have made a simulation with these parameters with a horizon of 100 periods of difficulty, I assume that the bitcoins are put in account and never touched until end of period regardless of the contract stops or is going.

So I obtain the next graph of mining profitability vs steady price increase per period of difficulty. The conclusion is that the contract can make ROI if the price grows at least at 6.8% per period of difficulty.

In the following I will make all calculations for 1 TH/s of bitcoin contract, every contract should be proportional to this and the conclusions aplicable to any hashrate.

The ROI nominated in bitcoins in Genesis mining depends on the following factors;
1. Company should continue paying.
2. Price of adquisition of the contract (price varies per hashrate because a discount in high hashrates, 3% discount codes and referral programs). I assume a contract price of 135.8 $ for 1 TH/s.
3. Fee size nominated in dollars. I assume 0.28$ for 1 TH/s
4. Difficulty grow rate. I assume 5.7% every 2 weeks (1 dif period).
5. Bitcoin price increase per difficulty period. This is my variable.

If you have the bad luck of early bitcoin decrease in price or big increase in difficulty you face big lose in Bitcoins because the contract stops, but if the increase in difficulty and price is steady you can lose little or maybe have some ROI (very little)

I have made a simulation with these parameters with a horizon of 100 periods of difficulty, I assume that the bitcoins are put in account and never touched until end of period regardless of the contract stops or is going.

So I obtain the next graph of mining profitability vs steady price increase per period of difficulty. The conclusion is that the contract can make ROI if the price grows at least at 6.8% per period of difficulty. If price stays the same in mean and difficulty continues increasing at same rate, then you would lose 60% bitcoins.