The only game I can remember right now where I've completed it 100% was Final Fantasy VIII and I believe I have a good reason for it. You see, it was my first Final Fantasy/serious RPG ever and I was dazzled by the graphics, story and whatnot. You could say i was slightly obsessed with the game. So I leveled everyone up all the way to lv. 99 just for the heck of it, I completed every sidequest, collected each useless item and so on. I tried doing the same thing with other FF games...Yeah, it wasn't as fun anymore.
You see, I would like to finish every game 100% because I feel that if I don't, well, I'm not really getting my money's worth. Bu just completing the story, I feel like I just wasted 30 dollars (Half of the game). I mean, you can complete the story mode in a few hours. So why not try and expand the game's fun by doing sidequests? For example, i tried doing all of Final Fantasy 12's sidequest and I felt okay because I was approaching the end of the game a few weeks after I got it. It extended my gaming experience by a lot. A LOT.
And that brings me to the fact that sidequests and whatnot are okay as long as they're fun, like stated in the article. For Final Fantasy 12, I was having fun until I realized some were never ending and that I had spent the last 5 months doing sidequests. So I stopped right there.
As far as trophies, yeah, I would like to obtain more trophies just because all my friends have more than me so i wanna be a 'cool kid' like them. And I do feel the need to complete every single achievement listed. But, and here's the kicker, I am too lazy. that's right: You can counter this obsessive behavior with good ol' laziness. You see, I WANT to do it, but I won't. So there ya have it.
NOTE: I was into Pokemon when I was a kid. I learned the first 150 Pokemon and I ALMOST caught them all when I had my Yellow Version. Then the next 150 or so came out. So I gave it a shot and I tried to learn the new Pokemon. I never even got close to catching them all, though i tried. Then another 100 came out and I tried one last time. Then another hundred and by then, I was old enough to realize that it was some never ending bull. Now that the new game came out, I pity the kids who buy it because I know they'll soon become obsessed with it. Not only that but I think the concept of Pokemon is overrated and boring now. It's pretty smart the way Nintendo keeps releasing new Pokemon to keep the fans hooked. But for me, it's just plain boring and dumb.