At this time in my life I don't have the necessary patience to grind, grind, grind, grind... and grind some more. And every free-to-play game relies on the grind to make money. The logic being, "Hey players that want to climb the ladder to avoid the grind they'll pay real money to buy items and XP boosts in the game! Cha-ching!"
Think it's boring to run between objectives? Well, there are vehicles available for purchase right now rather than grind with the idea that one day, maybe, you'll have enough in-game currency to buy one and affirm yourself a masochist.