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Just remember - there are only about 300 Heart Quests in the game.
There are over 1,500 Dynamic Events in GW2.
There are more Points of Interest to explore than Heart Quests - almost 3 times as many.
There are more Waypoint for fast travel to unlock then there are Heart Quests.
The ratio of Heart Quests to Events is purposefully a lot higher in the early zones to help guide new players.
The Map tells you how many of what there are in the game... (this is an old picture)