The most recent run I did on my hunter, I never set foot in Ghostlands, nor did I need to fully complete Dustwallow Marsh. There are a LOT of quest lines in each of these zones that might not be available unless you progress and complete story-line quests in order. Northern Barrens and Andorhal are especially bad in this regard, but many zones you can easily miss out on a lot of quests if you don't do a vital quest. So make sure you keep an eye on the minimap for quest ! indicators.
How many hours will players grind for a token now worth $15? On the Chinese and European servers — which include Eastern European countries where minimum wages are less than the equivalent of $2 per hour — there are plenty of people willing to sell their time for these prices. There is more of a question of relative value in North America, where players tend to value their time more highly relative to subscription costs.
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