Thats armor stack, not loot trader. Every boost group that is not total BS will just hand out all the loot that drops. Usually they also make sure that only 1 person per armor class is boosted at the same time or that looters do not interfere with each other too much.
Besides that hc runs are around 160k in EU usually, at least if you don't go straight to the big boosting communities but to regular guilds with boostruns instead.