Bank roll management vs monthly income
Here is a basic question that is not really relevant for me, since I may never move beyond 2NL or 5NL
But for the sake of argument, let's say you have a BRM that says that when you have 20 buyins you can move into the next level. And this works for you for instance through 5NL and 10NL into 20NL.
So you went through 10NL in for instance 1 month, doubling your bank roll from $200 to $400 - you made $200 in that month.
Now you are playing 20NL and you seem to have found your level. You are playing even with those boys. Careerwise, you are doing as well as you can.
Incomewise, you are not gettin' any. But if you move down to 10NL and STAY there, you might make $200 per month - forever.
Is there any rules of thumb for deciding which level you want to play at, in consideration of income?