This isn't about mask achievements.
I have a few friends who play together. They're very casual, playing infrequently and having no plans to raid, ever. And yet they seem to have a ton of fun.
At the end of semester I became a little more like them. I played less. A lot less. I had final papers to write and a few exams to not study for. I simply did not have the time. WoW is my primary source of entertainment, so you'd expect that I would be really down.
Quite the opposite: I had more fun when playing and in general I was happier. This was despite the massive stress.
So what does this have to do with Halloween candy? Think of how a little kid eats it: gone within a couple days (let's pretend he got sick too soon to eat it all that night) and then he's deprived, also very sick and possibly diabetic and down several layers of tooth enamel. He's a hardcore player. He's Ensidia with KT down within a week or two and wondering why there's so little content. I'm the kid who ate it in two weeks: significantly slower, but still not exactly healthy. My friend is eating a piece or two a day and he'll eat the last the day before Halloween.
This got me thinking of diminishing returns on happiness derived from WoW. Early on playing more means proportionately more fun. Eventually though, you run into diminishing returns. The extra time turns into less adventure with friends and more farming for 25-man raids out of whom you may only care much about a handful. The extra time is grinds and farming and all the aspects of the time which we refer to with a very accurate term: time sink.
Imagine what WoW, and our enjoyment of it, would be like if we all played half as much. There would be no need to add time sinks because a couple raids could fill a week. Imagine how much slower content would be cleared. And then imagine that the devs might be able to make content at the rate we clear it.
Bah, wishful thinking. Someone is out there is saying: "Give me that bag of candy, you wuss, let's see if I can get purple vomit."