He got 24 kills in 600 hours, thats pretty non stellar utilization of his class.

But just to list a few of the advantages of 51 over 41 for an AP
1.) 10 ranks worth of HP/Mana/MV/practices and 2 trains
2.) The pile of edge points you get for reaching level 51
3.) At level 51 nobody is higher level than you which is nice if you depend on landing spells
4.) Because very high level characters also happen to be very high hour count chars that is where you are most likely to have a charge rich set of enemies
5.) You have access to more wands/scrolls/talismen
6.) Demand works on a wider range of mobs (demand is really cool if you get it up, especially for rapidly getting keys and regearing/getting gear to trade or barter)


That is just a few but combined they can make the game play out a lot differently. Finely was a heck of a role player and he was rather creative in how he went about gearing and protecting his weapon but he just didn't dive into the PK realm often enough to master the minutia of the class.