Storage.
Is there enough?
Even with the space provided by a belt pouch or inventory bags (an extra 10 slots when runes are used on both) - given the sheer amount of items dropped and things to collect in GW...my guess would be a distinct 'NO' and that 'extra' storage is on many people's wish lists.
How many players have inventories full of collector items just waiting to be offloaded or taking up valuable slots because you don't have the correct number of items needed?
Probably quite a few, yes?
The simple answer to this problem would be to give collectors a 'running memory'.
Should,say, you only have 4 items of the 5 needed - you can still hand over the items you have knowing the collector will 'remember' how many you need to finish the transaction - temporarily freeing up an inventory slot in the process.
Collector memory wouldn't need to be NPC specific as all collectors of a certain item would keep the same running total.
G




