Terminology

It seems some explanation of terminology is in order.

VP$IP = Voluntarily Put Money In Pot.

This is a measure of how often a given player choses to play a hand before the flop.  Any time a player takes an action that puts money into the pot (i.e. limps, raises, completes small blind, calls a raise) it counts towards his/her VP$IP.  In 6-handed games, tight players will have a VP$IP of around 20% or less, looser players will have VP$IP significantly higher (i.e. 25%+).  Basically, VP$IP is a measure of pre-flop looseness.

% Pre-Flop Raise

This is the percentage of the time that a given player puts money into the pot before the flop with a raise (rather than call or fold).  This number is <= VP$IP and the ratio of PFR to VP$IP represents the proportion of the time that a player plays a hand for a raise, rather than a call or fold.  Passive players will have a PFR % that is half or less their VP$IP, aggressive players tend to have a PFR% of 75% their VP$IP or more.

In general at 100BB tables, decent players have stats somewhere in the neighborhood of 22/18.  Really bad players will have stats along the lines of 50/5.  Players with high VP$IP and low PFR are playing too many hands too passively.  They are not actively growing the pot nor thinning the field when they have what is likely to be the best hand.  They are also probably playing too many easily dominated hands in multiway pots OOP (out of position) and are likely to be unable to fold middle pair or better on the flop.  This is an easy way to lose money really quickly.  The hands in my previous post are good examples of this.