Looting isnt the problem with collection quests anyway...

The problem are the extra mobs you must kill to do them.

To do a Kill 20 so-and-so quest, you kill 20 and your finished.

To do a Collect 20 so-and-so quest, You Kill 20 and your just started... even at a 100% drop rate you need 100 kills to finish the quest. (note: some quest s have one of the item drop for each party member, for those quests collection is fine)