I've recently spotted a number of players doing this with the obvious intention of bringing down their average rating to get in a weaker cup and have more chance of progression. My friend also seems to think it affects the quality of the league you wind up in too.
It makes some sense to me as 6 of the 14 teams I had in my league started as 4 or 5*, he only had 2 at this point. The winner of the cup I was in was a level 7 who started off with a rating of 32.0. At the end of the cup his rating was 47.3, I think he is now buying weak players to bring it down again...
Does anyone else employ the tactic of having weaker reserves to lower their average score, or is it just the few I've seen?