Back when I used to play MTTs in volume on AP I noticed my biggest cashes came in streaks, and the periods in between I mostly broke even. If you go to a database sight and look up the people in the top 10 on a particular sight and look at the total listed MTT results page on their profile you can see examples of this for most of the volume players. If your winning you need to play as much as you can, and if your losing you need to get in a game your beating at that moment, perhaps a lower/higher level or different game like PLO or HU sngs.