I just don't like PPS, pool owner takes away the "risk" of bad (and good!) luck at the cost of a huge fee: I prefer keeping the luck for a much lower fee.
There are 0% PPS pools like abcpool.co which means you have zero risk as well as zero fees.
If you don't mine in such a pool then you either support other models for ideological reasons, or like to earn less money for some masochistic reason.