Yeah it's that way with a bunch of sites. Buzzcomics is the same way, the top comics are on the front page so they get more and more hits and stay on the front page Changing it up more often might not be a bad idea.
I dunno... those top comics on bcx are part of the reason that buzzcomix has any traffic. Also, they DESERVE to be in the top because they get the most votes. if you read through some of the top ten bcx webcomics, I guarantee you'll be very impressed (other than that saturday morning breakfast cereal one... it's not all that funny.) but stuff like misfile and krakow... gosh I just love them!!
so while I think it would be nice if they somehow changed stuff around so that it's not always the same comics on top, it just doesn't quite make sense to do so.