Yeah, now I understand. If a pool that is finding just a few blocks a year went to PPS, they would bankrupt in a week.
Not really, it depends on their "reserves" and the fees they charge, if they only find a few blocks a year, it simply means they have to pay a very small amount of rewards based on the fact that they don't have many mines which is the reason for not finding blocks in the first place, so as long as their reserves and fees follow the formula above, they won't go "bankrupt in a week.".
viabtc is the best pool. Checked them all. Very nice pool.
F2pool has 2.5% and it's PPS+, they are the largest pool tho, which we should avoid giving them more "power".