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His pool is small doesn't mean it's not good, I also doubt that people left his pool because it didn't find blocks, it used to find "enough" blocks in "decent" periods when enough people were there, I think people left because 1- they prefer PPS pools (proof is that vast majority of the hashrate is pointed towards PPS+/FPPS pools). 2- his attitude.
Now back to Poolin, I did try the pool in an attempt to leave Viabtc, and well, I don't quite like this pool, while I was testing it, my hashrate dropped to zero on the pool phone app, I was a bit far from my PC so I had to rush and call my guy who lives next to the farm to go check the miners, he said all miners were hashing, shares are being accepted, I checked again, 0 hashrate.. and since I don't want my gears to be mining for poolin without me getting paid, I had to rush to point my gears to another pool, after a while, I checked their telegram group and I saw them talk about a server/code update of some kind that caused this whole mess and that the real shares/hashrate was not affected.
While I (like you) mine for profit, I don't like to mine to a pool that hires unqualified programmers to handle their system, the hashrate reporting was off for hours, I didn't even receive an email from them "well they said they sent it to everyone after the noticed the issue, but I didn't get anything from them", well, obviously after this incident, I never went back to Poolin, and most likely never will.
Now, why don't large pools with good capital hire people who know how to operate a pool like Kano?