For what it's worth, I ran 21/13 today playing 6 max. I made $250, of that $41 was raising hands other than AK/22+/Tens-or-better-suited on the button.

Once you get to the $1/$2 level online, stealing small pots from multi-tablers becomes a pretty key revenue stream and 55-22 go way down in value as people stop stacking off with one pair in unraised and lightly raised pots.

Also, another reason I play so many hands is that it makes it more difficult for aware players to figure out when I have a top hand. If you run a low PFR, you will get less action on your big money-making hands.