Hello there.
I like the idea you're getting at, but there is a slight problem with it: you can never truly gauge the number of lurkers because some of them won't respond to this post. But I suppose you can get a better approximation, so I won't go as far to say that the whole thing is futile.
Some research says that lurkers make up over 90% of online groups. I suspect that Less Wrong has an even higher percentage of lurkers than other online communities.
Please post a comment in this thread saying "Hi." You can say more if you want, but just posting "Hi" is good for a guaranteed free point of karma.
Also see the introduction thread.