When confronted with someone who won't put in the effort but expects the reward, what I would do is simply waste their time.

I thought of this with the afk wintraders in the Feast. Someone's going to afk and throw the match? Fine, nobody fights. Match ends in a draw, and they get NOTHING. Same applies here. Not gonna fight but you'll roll on loot? Fine, get starved for loot. If it's up to me, I'll have a whole party simply afk as well, or leave you there alone. Have fun getting that precious loot solo.

It might seem petty, but no one gets a free ride.