It is tempting to move up, but then it becomes tempting to stay up there because now your stakes' pots look tiny. You might even win a couple pots and decide to stay up there, under-bankrolled and in a somewhat dangerous situation.

It feels better to crush the limits you are comfortable at and build the BR than to struggle with scared money at the higher stakes.

Thats just my opinion though, because Im not too disciplined sometimes. Ive sat at some bigger stakes with half my BR just to see what it feels like...but I ran before I even saw my cards - did NOT want to see pocket As get cracked by some booty.