Quick question: What is the Group Finder in World of Warcraft intended for? If you answered that it’s for finding groups, possibly with an incredulous expression that anyone would ask such an obvious question, congratulations! You are following along here. If, on the other hand, you answered “for advertising runs through content being sold for in-game gold,” then you are not following along, you have an odd definition of the words “group” and “finder,” and you are not going to be allowed to use the tool much longer because, as mentioned, that’s not what it’s for.
This doesn’t mean that people cannot offer to sell runs through content, of course; it just means that you will need to advertise it throug means other than the in-game group finder. Trade chat and such is still permitted. It just clogs up the group finder interface and is generally undesirable, so Blizzard is cracking down on the practice. Bad news for the people who sell though the interface, but good news for everyone who just wants to find a group.