Saw an interesting post on HF's facebook page (https://www.facebook.com/HashFlare/posts/1972295183040794) where someone was asking them to explain why the payout per th/s seems to be based on a smaller block reward than what the pools are actually receiving (12.5 BTC vs 17.5 BTC = 30% less)...they have yet to answer the question.

My understanding is it is due to the difficulty increasing but I'm skeptical because one would expect this to be across the board globally but around a month ago my Genesis mining contracts that was paying .0015 avg. daily for a few months dropped to .00075 avg for a few weeks now down to .0005 daily which is about a 1/3 of what it used to be however my mining contracts with Hashflare and elsewhere did not drop until recently and no where close to the level of Genesis.  I have a support ticket in asking why but of course like everywhere else, they are back logged and I'll likely wait a month to get a response which of course will also likely be generic and not answer my question.

20 DECEMBER 2017 (SHA256, 34% AntPool/33% Slush/33% f2 pool): 0.00012560 BTC
21 DECEMBER 2017 (SHA256, 34% AntPool/33% Slush/33% f2 pool): 0.00013179 BTC

Pretty close.  Switched back to Ant 100%

100% Antpool

2017.12.14: 0.00015274
2017.12.15: 0.00016215
2017.12.16: 0.00015657
2017.12.17: 0.00014935
2017.12.18: 0.00015026
2017.12.19: 0.00014398

(avg: 0.00015251)

34% Antpool / 33% F2Pool / 33% Slush

2017.12.20: 0.00012560

Maybe the change last night was a bad idea.  Pretty significant drop 17+% but also not avg. over 6 days.  I also stumbled across this site and while the numbers change I have never seen it over the past few weeks show any pool on top other than slush -> https://poolprofit.io/en/ so it may be a promotional site with some bias.  Performing a whois lookup on both slushpool.com and poolprofit.io shows the exact same Cloudflare DNS servers which is odd because I have many accounts on CF and not a one has matching DNS server sub-domain names, some may share one but none are both in same order so that seems suspicious.  The registrations are from different folks but they may have overlooked this one aspect if both domains are under the same CF account.