GW2 Gold players don't necessarily have to complete their tasks.
The amount of experience handed out shows how ArenaNet wants people to play. Killing standard monsters results in very small experience gains. It makes no sense to sit there and try to round up and slay packs of mobs. Instead, the big chunks of experience come through events and story quests, emphasizing participation in structured content instead of rewarding those willing to put up with tedious grinding.Quests come in various types, and from what I've played so far, at level 19, not all are equally entertaining. Scattered around zones are NPCs represented by hearts, all with unique lists of objectives. GW2 Gold players don't necessarily have to complete their tasks, though the financial rewards for doing so make questing for the heart NPCs seem worthwhile. And after their demands have been met, they'll sell items, some of which can be powerful. Sometimes the tasks are fairly straightforward: just kill a bunch of stuff around the NPC. Sometimes they're goofy enough to be entertaining, like bottling worms and fireflies or protecting baby animals, but at other times the tasks, particularly those that emphasize fetching and collecting, are too safe and conventional to be memorable.