1:150 is a FANTASTIC ratio & if you can convert across the board at that rate, you'll be a rich man in no time
The rates are all different & PPS/Revshare don't really play into it because the surfer has no idea what that means. The surfer sees either a free or cheap trial or they see a monthly membership with no trial option. It's easier to convince a surfer to take a 3 day trial for $4 than it is to convince them to shell out $30 for a month right off the bat, so conversion rations for those tend to be a bit higher.
(I only threw the PPS thing in there so that I could give a "money per click" example)