Because groups are for msn.

I had a group stuck as my 'primary group' in my profile, while I wasn't registered into a groups anymore.

I created this one so I could set it as my primary, instead of some other lame-ass group about a game I don't play anymore or I couldn't be bothered with to visit or whatever.

By now I've thought about groups so much the word 'group' is starting to sound strange.

Anyway, groups are for msn and it doesn't even work out for them.
'Guess subreddits is all you really need.