Idk why more people don't mine with them

To me it looks like you make more money with Ocean than with any other pool, with one exception: a miner with a significantly-above-average amount of hashrate could do better with SBI Crypto

Ocean also finds blocks regularly enough nowadays that I don't see why their variance would make a significant difference, but I've spoken to at least one person who says it makes a big difference because with non-Ocean pools you get a single daily payout that's almost always the same size as yesterday, whereas with Ocean, payouts are sporadic and have different sizes each time. Apparently, even though Ocean's payouts end up being slightly larger when averaged out over time, some miners find the accounting annoying enough to just use a regular pool where you earn slightly less but it's more consistent