I've quit this game so many time I got a custom title: Lord Of Rage Quitters (1) and soon to get the second and highest tier within the next 6 months: Permanent Vacationer (2). Well not really but I've quit due to: many people I enjoyed playing with quitting, elite boredom (happens when you've done everything and own everything in existence), inactive guilds, life, technical difficulties.
Usually come back when I'm feeling nostalgic or when a few good buddies of mine and I decide to get back together and play for like a week or so then quit again. lol New content also brings me back. In fact, thanks to the addition of the
Eternal Blade, this game has sucked me back into playing (soon as my new pc arrives). Maybe some luck will be on my side and I'll get one. Or spend whatever gold is left in storage and buy one. Then wait till the Wintersday event arrives.

Then its time for Crysis. Breaks are good imo.