Stick to one site with decent rewards (like rakeback at Full Tilt) as your main site. Its great to have a bankroll on more than one though, and is good to have the big sites downloaded as they all run their own promotions from time to time, and obviously you can use the freerolls etc when your short.
I only suggest focusing on one site while your stepping back and starting over. Your going to progress fairly slowly and its kinda pointless earning a low amount of frequent player points on two, three or more sites. Its far better to earn the majority in one place and reap a few of the rewards. You dont mention what level your at with regards to micro, low, med or high stakes, but i'd suggest that even at low stakes you could hit the lower level Iron Man (bronze) on Full Tilt every month, which is worth looking in to for the goodies from the Iron Man store and the cash bonuses they throw out.
Obviously, dont go broke trying to get there, but if your sensible, solid and play within your limits, you should be break-even player at worst while earning your 50 points per day.
I dont wanna look like i'm promoting Full Tilt here, because Stars is a great site too (poss my fave out of the two currently) but Tilt have the Academy too, where you can watch tips from pro's, then complete challenges at the real tables utilising what you've learned. Its really worth a look!
Best of luck.