Boredom. Friends left. Busy with life. Innumerable other reasons.
Me, I'll probably quit soon, as I've mentioned to a few others. It's developing into a little bit of a bad habit, in my opinion. Too much time wasted that could be spent on more productive things.
Plus, it get's boring hearing feminists and men's rights activists battling with each other behind the anonymous function, pouring out vitriol, doctored stats, and unfounded accusations of malevolence. Life's too short to be dealing with negative people.
New ones comes in, old ones comes out. Some leave early and no one bats an eye. Others leave later and no one bats an eye Some new ones become popular and old populars leave and leaves their legacy... It's the cycle of life.
Good people are leaving so you miss them and feel like leaving yourself also you get bored with some of the questions and feel like you could be doing something better. At least that's what going through my thoughts now.