I do this sometimes and I'm not bad. Alot lately, actually. It's from boredom. I sit down, make a decent hand, am up half a buy in and then just can't stand the thought of sitting here, too boring, so I figure I'll cut and run. I used to go for 5000 hands a week and now I am only posting like 2500, my boredom is killing me.

Another reason: I typically run about 16% VPIP full ring, but if I am up this creeps towards 20-21. I have to force myself to not try and use my momentum to dominate the table...which can work it short but in full tends to bust you. I play better when I am even or down but not tilting.