This is over the 12 months which obviously the difficulty was much less 12 months ago with a lot higher BTC rewards back then (and lower dollars since it was under $3k). Using the spot price of BTC when the reward was earned, I made $1189 in December and am already at $338 this month. As I mentioned, that is the past which has no bearing on the future. I have not had anyone do a detailed review of my numbers and math. If you are interested in confirming both, I am happy to share the details. If you look at the past week CDT of 0.00015486 and quarterly of 0.00012451, the difficulty change has made an obvious net earnings change since it is less than half of the yearly per day average.
Minergain - I'm currently running about 100 S9s, with 10 more coming online Friday morning and 11 Avalons on order. I recently switched from Slushpool to Kano due the fee difference (and discovered a much nicer user community as a bonus). For me, its just business - I will make more at Kano than any place else I've found at an acceptable variance. Kano's example was 7 BTC difference, but does it really matter if its 7 BTC, $5000, or $1000 over a year? Its still more.