There seems to be an issue with the legal text here.

Under section SERVERS AND HOSTING,
"sell entitlements that affect gameplay provided that they do not adversely or negatively another player's experience and provided they do not give a competitive gameplay advantage"
I believe you are missing the word 'affect' between 'negatively' and 'another'. 

(Sorry if it's my grammar that's wrong, as I can't imagine something like this slipping into legal text of all places. I have marked this a higher security level because it has to do with legal stuff and maybe not something you want publicized.)