Just my perspective....
JW's are more of a fringe group then we probably realize. Sure, it was our entire life, but the JW experience, unique as it is, doesn't in my opinion have the same outside interest as Mormons (Money, greater numbers on the rolls) or Scientology (many celebrity sheeples) inspire, though it's easy for us to see the many similarities in control, activities, etc.
Someone commented already that 'JWs do not attract thinkers.' Well said. A consequence of all of the "1914 Generation Won't Die" is the apathy bred. It seems that most who have left never cared that much to begin with. Those that do care or were neck deep in it (as I was) come online because we cared and probably continue to show that caring in the posts and conversations we choose to involve ourselves in.
Let's face it, if you got involved due to mild amusement or just because the JW at your door happened to be more persuasive then average, your investment wasn't very big. So, no big deal to leave, fade/go inactive, whatever works for you. You probably weren't activist minded enough to knock on doors more than a couple of times a month, attend some meetings. Likely, your lifestyle didn't change too much as a result, so, why get online and vent when you didn't care that much to begin with.
For my part, I've needed breaks. Lately, I am more at peace with my past, which allows me to hang around here with a different perspective to share. It also doesn't affect me like it once did to share my past.