You brought up a good point.
However, out of the responses I've seen here on wiichat, they are more desparate, then actually needing the boost (e.g., to boost an alt, etc.)
For example, when you see people boosting on COD, what's your response?
First would usually be pissed off, because, look at all the videos of people stopping boosters.
People have been perma-banned because of boosting.
You're cheating the game.
I don't view leveling up as a chore, I see it as a challenge. It's only a chore if you make it into one.
If you want to get a grasp of a good majority of the weapons, play heroes.
Pick up dead 56ers weapons.
I understand it's a personal choice, and I completely respect that (in some sort of fashion), but I still view it as completely unnecessary (See: COD rant).
The sense of accomplishment is not *inherently* needed for a game, but it becomes a major factor of enjoyment.