It has meaning and is not just idle chit-chat...
If you want to play a tough guy you have to be able to back it up somehow. If you piss off the wrong guy you _will_ regret it. Finding a true friend that helps you out if you are in trouble is so much more rewarding...

Sure, you can get more RP in other games but will it be better? What would you prefer: To save the damsel in distress in PK:Optional MUDs after arranging a battle or save her life by reciting a recall scroll just in time before succumbing to the Emperor and his mob?