When you are mining solo, fees should be the least of your concern; you have a slim to nothing chance of hitting a block, so worrying about 1% less fee is insane. I'd rather pay 10% to CK or Kano knowing these two won't rip me off, than risk mining to a pool with 0% fee which has not proven that
1- It would pay out (this includes ViaBTC too, by the way)
2- It has been able to actually hit blocks in the past (it could be a buggy pool which loses blocks)
yeah pools paying out are very important. Wining a block for 3x120,000=360,000
ck pays
viabtc pays
kano pays.
I do not know of any other pool as to whether they Pay solo blocks.
If you run a 100th miner it should take about 6000 days to hit a block.
If you run a 1th miner it should take about 600,000 days to hit a block