It's really not that surprising. There are very few teams between 1800-2200 that play as a team consistently. Most teams from 0-1800 are just randoms on oQueue, and most people that form teams and play every day or a few times a week are over 2200, because those teams can easily stomp out randoms from oQueue.
Kind of how it goes with RBGs, too much of a hassle to set up consistently with good players unless you treat it like a raid and have scheduled times for things.