From the QuakeCon Demo, its pretty evident that most perks ARE NOT active, meaning they affect stats like damage or percentage for crits, penetrate armor, etc. So what do you think is the REALISTIC number of active perks, not the passive perks.
Examples of ACTIVE perks:
-Shield bash
-Power Attacks
-Slow time for archers
Examples of PASSIVE perks:
-Increased Crit chance
-Increased Armor Penetration
-greater % to block an attack