Don't listen to peacebrother. I made it up to $190 so far on Players Only starting with just 1 freeroll cash of a couple dollars, and it didnt take more than a few weeks to hit $50.
Just started trying to build my BR back up on Full Tilt. Had made it up to $20 back when I first started playing
online poker, but lost it all just having fun playing poker after a nights of drinking. Built it back up a couple times, but did the same thing again. Had $1 in my BR on full tilt 2 days ago, now its up to $2. woohoo.
Its definitely possible, my friend went from $0 to $350 not that long ago. Then he went on major down swing and cashed out before he went below $200. Then he built his $10 back up to $200+ and cashed for another $140.
But watch out for tilt, which is where he lost big chunks of his BR. And also walk away from the games when you don't feel like playing or if you don't think you are going to do well. Time off from the game is never bad.
Good luck.