When they form a new team it resets their rating to 1500.. So you have originally 2000+ rated players farming teams for gold at 1500 at a steady pace. So any new team has a really tough time starting. This is why I suggest a permanent personal rating. No team rating rest. If you change teams your rating is whats kept. You can make 100 teams but you will face other teams similar to your teams players avg rating. It would keep things fair.