I'm not surprised about the number of readers that visit but don't comment since I can tell that from my blog stats but I am surprised that more people don't use a blog reader service.
The biggest advantage in my opinion is that I don't spend time visiting blogs that haven't updated since my last visit....a disadvantage is that there's a delay between a new post and the update on the reader service.
For those interested in checking into one - I've used Bloglines in the past and now I'm giving Google Reader a try. I like Google Reader better at this point than Bloglines but I'm not sure why because they are really very similar.
Thanks for responding!
Poll Results - 266 responses
26% read and comment from my blog's homepage
23% use a blog reader service and come to the site to comment
45% read from my blog's homepage but don't comment
3% other options not listed