You never know if the workers are even working on a block. Stales go through the roof.
Multiple rounds become stacked as a huge round & you never know if an ultra-long round is even genuine or if it's just variance.
Maybe 3 rounds disappeared for all eternity as unclaimed blocks, untracked by the software. Maybe they didn't.
I check up on workers, just to see they had 'connection problems' for the last 5 hours even after patches, and the pool is not even under DDoS.
It gets solved for a day or two & begins again.
The pool has degenerated into solving less blocks than pools 5-10x smaller.
http://pident.artefact2.com/pool/Bitcoins.lcFact is, I don't want to quit. Seems many other people are not quitting either.
But this stuff adds up to huge losses over mining at other pools & is soon not worth the 0% fee perk.
Not everyone is casually mining with a CPU, this is starting to cost hundreds of dollars in the short term
unrecoverable even by a few lucky rounds.