Is B&M low limit waste of time?

California 3-6 is definitely beatable. I'm more than $12/hour up in 300 hours play so far this calendar year playing a fairly standard TAG game (agree Lee Jones is excellent for this sort of game). But you do have to expect to take some swings along the way. And it is essential to be able to maintain your composure and not tilt when your TPTK gets taken down by 7-5 on the river two hands in a row.