Confusing feed issues

Ok, maybe I’m confused a bit. I created a Feedburner feed for my page and it shows me how many people are using that feed. Everything shows that three people are using it. Thanks to public blogs with bloglines, I know the three people. Or at least I thought I did. Lurking through some public blogs on bloglines, I have ran across a fourth person. Is it just they haven’t logged into bloglines in a while or what?
I think that is how Feedburner works that the numbers are who have pinged your feed in the last 24 hours. Just one more thing about how the web and blogs work.
dj