It's because you die less if your party has a cleric. And in party, you have bigger chance of leeching exp off a mob than solo'ing (many dmg > one dmg)

Of course you can be a meanie and just stand there waiting for everyone to do all the job

Hellz ya XD!
lol j/k
But ya. its good to have a party cause u need clerics. unless uwant to waste money on pots and stones :P.

being in a KQ and not being in a party is stupid D: cause then your exp doesn't really get anywhere until the boss where everyone kills it together.

Anyone know if lvl 17~32 KQs are gonna be put in game during CB2?

Ive heard rumors but nothing is definite :S