They could fix this by using exponential decay like Reddit and HN do with stories on the front page.
Another solution is to offer a few different top paid lists for each of the common selling price ranges. So have one at 0-4.99, another at 5-10, etc.... That way some of the more expensive ones are treated quasi fairly.
Also the ratings should be weighted towards the people that actually purchased the app.
i took a closer look at the site and their traffic after an informative discussion with another hn reader via email, and i'm really wondering if any devs that paid for this found it worthwhile.
That should read AppCraver, not Apptism, right?
Speaking of Apptism, I like that site a lot, except that I can't figure out what those little numbers in red circles mean. I'm sure they explain on their site somewhere, just haven't found it yet.