The real answer is that your VPIP and PFR are going to be different depending on the texture of the game you are in. 6-max games come in all flavors, and the best way to profit is to play in a manner that's opposite the general trend of the table. LAGGY play with lots of continuation betting will enable you to crush the tight/passive games. However, TAGGY play and simply betting your solid holdings for value is what will get you the money in the loose/aggressive games.

While I don't think these should serve as a guideline, if you want to see the stats for a profitable 4-tabler, my stats for 4 tabling 6-max games at Party Poker are the following:

$25NL: Hands = 30570
VPIP = 26.49%
PFR = 14.30%
BB/100 = 10.58

$100NL: Hands = 55430
VPIP = 22.22%
PFR = 14.10%
BB/100 = 4.41

As you can see, I play LAGGY in these games. As the other poster said, solid postflop play is a must.