MORE THAN YOU KNOW
We lurk all the time! But, our posts have an extreme effect on the threads we post in, increasing visibility significantly. In addition, there are tons of "repeats", and it's not effective for us to post in all of them. Even further, there are tons of really good threads that I personally don't have any subject matter expertise in, so it would be disingenuous to you guys for me to attempt to represent those ideas.
(But we're always watching...)
This thread and a few others as exceptions, of course.