Diablo3: Unlimited Leecher Turn-Ins

With the latest patch you can have a leecher turn in your quests continuously while you make new games for them.

I've leveled another character on my other account already using this. Here is the format I used.

Player 1: Level 60
Player 2: Leecher

Player 1 makes game, 2 joins
1+2 kills ZK on normal mode, both take the soulstone, 1 leaves+resume, 2 completes quest
2 join 1 game, 1 leave+resume, 2 complete
2 join 1 game, 1 leave+resume, 2 complete
2 join 1 game, 1 leave+resume, 2 complete
And so on.