"Sometimes" to both....I do read a lot of threads, and usually don't post. It's rare that I will only post something like "good for you," or "I agree." I usually have something more to say....and a lot of times I will spend time writing up a response and then cut it in half or delete it entirely because my self critique is, "who wants to read that?" On the other hand, if it's something I am following, I will subscribe just to check back and see what developed, even if I have nothing to contribute.
I also send a link to a lot of posts to my sister and sister-in-laws...even if I am not posting....if the topic is something they are interested in.
I guess that's why my post count isn't very high. Someone called me on that once, writing something like, "you've been a member a long time, but you don't post much....you must not know what's going on." (I didn't think that was very nice....but you gotta have thick skin if you want to play in the yard.)
Maddle