1. Housing.
2. A collection tab akin to the mount/costume collection that INCLUDES treasure maps, monster trophies, rare fish.
3. Fun/gimmicky items that adds flavour to the game but not necessarily useful in PvE.
4. Rare mount drops from bosses (or from rare spawn mobs in ESO) like the Time-Lost Proto Drake in WOW.
5. Achievements for collecting every treasure map and/or making treasure maps useful.
1. Actually having a server available to play on Xbox when both North America and Europe servers are down for maintenance and there are people in the world awake and wishing to play.