Due to this game's design, characters don't have to "outgrow" an area, like it would happen in traditional mmorpgs. However, players don't spend time in several older maps, and I don't mean just core Tyria maps like Queensdale, but even the more recent expansion and living story maps. In particular, you hear complains regularly in this forum that LS maps feel "throwaway", as they come out, players get the meta achievement, and never return again. To me this seems like wasting the game's potential, so I ask what suggestions does the community has to increase the replay value of maps?
LS maps have specific rewards to grind for, but once you have them (or don't want them), there's no reason to go back (or worse, they have an excruciating grind like Draconic Mons did and players burn out from the process) unless there's a way to make gold out of it (see Istan), but there's no way one can add such metas to every single upcoming map due to various reasons.
Thus, how could ANet get players to play in a more diverse number of maps?