There seriously need to be done something to fix the problem
If you want to discourage conceeding, you need to fix the way team balancing is done.
No one wants to play their 4th chaos team in a row rated 300 points above them, while half their team is on the injured reserve.
And lets be absolutely clear- Nearly half of the active teams in champion ladder are chaos teams.
Too many players play their race of choice to a good record, then build chaos teams to serve no other purpose other than to put the competition out of action. Literally half of all matches these days involve a chaos team (or their dlc cousins, the nurgle, just as deadly with the 2-8 clawpombers per team). Too many more don't even have a race of choice and just like ruining teams without regard to the ball.
You guys have really got to put your heads together and find a solution. This is what kept the first iteration of the game from taking off, and its hurting the growth of this one. No one worth anything minds playing a chaos team or two, but when you play 4 in a row, two of who literally ignore the ball if it means killing mroe players, it gets frustrating.
You combine that with punishing players for conceding, a mechanic added by games workshop to give players a way to keep their teams alive. There is enough punishment built into concessions without taking the strategic option away.
You can punish DC's without punishing all concedes.
But really, there needs to be a way to guarantee so many team runs don't end because they get a bad run of the same race over and over. The simplest solution would be to not match a player against the same race he just played. If that means the overpopulated races have longer wait times for games, GOOD! Maybe we'll actually see more variety in the game then!