While the theory still holds, it will probably not work anymore. Last season you could win A LOT of games doing this, becasuse individuals had mmr they had to tank. This meant if a high level player was selling wins to a low ranked player, they would join and quit to lower their mmr to an easy level. These were most of the free wins you could get. The system has changed and it is no longer necessary for these people to do this. You are better off either grinding honor for gear and then paying a good player to help cap you, or to grind out wins the old fashioned way, by beating other teams. Good luck!