PvP combat [including dueling] should give a lot more combat xp than it does now, like at least 1000 depending on how many levels more the opponent is. Having a higher combat xp reward would encourage noobs to practice pvp, be it with more advanced foe or noob v noob. That way, you wouldnt have people with combat lv 8 going around with 0 pvp kills. Also, is killing 5 bots really 10 [or 5] times harder than killing one player [for killing 5 adv bots gives 500 combat while killing someone with a close to the same combat gives 50 or 100]? The more to encourage player interaction [even if they are just killing eachother :D] the better.

the only problem with that is it is exploitable if you make it any higher aticephytim.

Scenario with higher rewards.

Player A, a high level character accepts a real world cash payment from Noob B

Player A and Noob B meet somewhere

Player A allows Noob B to kill him repeatedly, giving Noob B 1000 combat Xp per kill.

Noob B reaches level 4 in less than 10 minutes, and Player A gets 4 mentor points in the same timeframe. If doing it as a duel they can do it close to the station and not even loose reputation.