The problem is not the tanking, the problem is that the match-up is not fair - this avg of 6 teams.
A group of six 6* teams playing vs two 9* teams and four 5* teams.
Also a team with 11 8* players is not the same with a team with 22 8* (who loans to the other members).
If I have 14 8* players and I 'm playing vs a team which has also 14 8* players, why would I care if he is tanking or not ?