You feel that more troll result in higher levels only because the higher level managers are more skilled at keeping a team in good shape.

When you played with people who have no idea how to play, of course it is easy to win

Many people quitted playing at higher level and took over a low level team because of the difficulty to win, or even keeping a positive balance.

Skilled manager playing at low level for easy win is smurfing, but this game has no rule to control it.