Preference Icons seem kinda wonky...
Not that this is game breaking or anything but...
So everyone knows how its supposed to work... If you queue up solo most of the time, you get solo preference. If you queue up as a 4-5 group most of the time, you get team preference. Anywhere in between, you get dynamic. I've actually had all 3 different icons at some point, but the rate at which one switches to the other is weird. To get the solo icon, I needed to play about 20 or so games solo, and then playing even 1 or 2 dynamic games will switch it to dynamic preference. A few weeks ago, I went on a short spree queuing up with an entire team for about 5 games, netting me the team preference icon. It then took, however, another 20-25 games as solo or dynamic to drop back down to the dynamic icon.
I don't even know if anyone really pays attention to which icons which players have, but to me it seems that they may not be completely representative of a player's queuing habits.