I agree with the other response, if the LM is doing their job then no worries. In my league that I'm the LM 5 out of the 10 don't know anyone else (including myself) in the league. 2 of them are good friends with each, I'm friends with two owners who are Dad and son and live in the same house. Trades have to be approved and I monitor all trades and/waivers drops and pickup also.
10 team 4 keeper PPR league: (Starters in bold)
RB: A.Peterson. Sproles, Murray (flex), DeAngelo Williams
WR: Julio Jones, Cruz,Garcon, Jeffrey, Douglas, ROyal