i am a noob but intrested in this thread. why was peopl baned? is it agent server ruls?

can someone plz inform me of what the big deal is with selling items and creds for RL cash? I mean i can see it the server sold it them self but as it is they dont, so not liek they losing anymoney. I have playied several mmog's over my years and have yet to see a server that does sell. I just dont ...