We cannot really compare..
See, the visitors are of four types,
First the persistent ones. They are those who are loyal to you and will lap up each of your post eagerly. However, tell me this, how many such readers can you have at max ? The scaling up is very limited in this case. But since they are the higest quality, keep them hooked up with active interaction.
The second type of vistiors are reasearchers. They have been looking for an information over the search engines and landed up on your page. There is a great chance that they will read your page and may even see more. Never ignore these people. For them make sure your content is good and is SEOd.
The Third type are stragglers who land up on your page from the Bookmarking sites like Digg/Stuble On etc. Since the data at hand is much more in their case and since the page is accessed from within the bookmarking website, there are chances that they will read just that one page and move on. Their attention span is also low and hence we need photographs / illustrations etc to attract their gaze.
The Fouth one are the most insignificant yet more in number. The trolls, pat backs etc. They come and go in large numbers but your blog is never on their agenda for the visits. Their existance doesnt make a difference and hence you need not even worry about them.
Long post.. hope I made some sense. :)