There seems to be a lot of folks here who never say anything...they don't even comment (which is perfectly OK). Everyone has their own strategy.
One day I was going through my voters on a post and many of them had no posts or comments and are just voting and they hold very little SP. But they'll grow eventually though just like the rest of us. Everyone goes at their own pace. I'm a "go big or go home" kinda guy so I jumped into this thing head first.
I wonder if they're not native English speakers, so don't feel confident to speak up.
It'd be an excellent way to learn English, come to think of it :)