Yes, if you are friends you are more likely to be in League, as well, if there aren't many at that level on your server you might see some of the same managers (this applies more as you get to the upper levels of your server). In the first few levels, say up to 4 or so, people do tend to leave if they get bored or frustrated; their Team runs on autopilot for about 70 days before it is erased.