Why the last one ever? If you have that big a hashrate,your earnings won't be going anywhere.
As difficulty goes up, the revenue (bitcoin mined) will go down.
Eventually, the revenue will not be enough for OP to pay the rent
That was my point. With him having a large enough hashrate to pay his rent,the difficulty increment can't possibly affect his earnings in a substantial way.
I.... What? Do you understand percentages?
If the difficulty rises 15%, your revenue drops 15%. If you have 1 gigahash, it drops 15%, if you have 10 terahash it drops 15%.
Difficulty increments affect everyone equally substantially.
Unless of course, you mean that he makes (for example) 10 000 a month mining, and only needs to pay 1 000 rent. Then an increase of 15% difficulty would only lower earnings to 8 500, still enough to pay the 1 000 rent. But looking at it that way, that's more substantial losses the bigger the miners you have! 10 000$ revenue dropping to 8 500$ is a bigger monetary loss then 10$ dropping to 8.50$....
But percentages don't discriminate, they affect everyone equally.