You should report him. It's not against any rules (as far as I know) to intentionally lose games to tank your MMR, but he's abusing the GM system. Blizzard should act on that. I wouldn't think a suspension would be in order, but he should be removed from GM as should anyone else who does that.
not threadworthy. The guy is probably dropping to a lower league to farm portraits or something
"life of lively to live to life of full life thx to shield battery" The measure of a terrible day is when you go to bed thinking "man, I wish the zombie apocalypse would start already"