If the turn 3 trash mobs dropped 3-4k like AK or WP, groups would still run past them and skip them because they don't drop loot. I don't know anyone at end game that would want to kill those mobs for 3-4k is not be enough incentive to kill the trash mobs. Talking about like 30 min to kill trash vs 3 min running past them. Most people at end game have all the crafts leveled could make 30k+ in 30 sec by crafting some random hq gear. The only way people would kill skipable trash mobs is if they either blocked the jump pads until the trash was dead or killing them all gave you loot at the end.