They can't be...that would mean sitting in front of the computer constantly. I posted my blog a matter of less than 5 minutes before the "cached" page was deleted and rebuilt...yet they remained #1. They don't update their blog every 15 minutes. I know they blog a lot and that's great, but there's got to be a way to give other's their time on the page. I am serious and not exaggerating when I say that they are ALWAYS on the top. I've been paying closer attention to it the last couple weeks. I'm on motortopia multiple times per day. They are always there at the top.
Maybe one suggestion should be time of original blog. Edits should not change the time of the blog post. I don't know that this is what they are doing, but again, every 15 minutes? I really don't think so. I believe there to be some type of glitch in the system that is allowing them to be at the top all the time.
I suggest you keep an eye on it. You will notice that no matter what, they are always on the top. Anyone else blogs, they are automatically #2 on the list. Try it yourself. You even have the benefit of timing it so it is posted just before the new cached is loaded. You will see that no matter what, they stay on the top.