[vanHelsing]

Once I have mastered a level, I use to multitable it to death up to the point, where I feel ready to move up further.
Then I go back to 1/2 tabling and that's the phase where I really learn something about the game. Then the cycle starts again.

For a number of reasons, I guess, a full time player should always aim at moving up, which usually won't work when always multi tabling.

And yes, I make more than 1 buyin/day on average multi tabling.