Wow my Bluehost server has 2,649 sites on it! If each site had only one domain name, then Bluehost is grossing around $15,000/month from this server. Many Bluehost users have multiple domain names. But even if they had 3 per user on average, than Bluehost grosses $5,000/month for this server.

The few I looked at with domainvalues.com all had insignificant traffic. Occasionally the Bluehost server slows way down with a high server load. My guess is that a small handful of sites cause this and I'd be curious to know these sites' names.

Is there a way to just look at a list of sites that have more than a certain number of daily pageviews?

Well done. And fast. I've always wondered how this works, you cannot just query the host, can you?

As these reverse IP services disappear frequently, here are some alternatives:

http://sharingmyip.com/

http://www.yougetsignal.com/tools/web-sites-on-web-server/

http://www.myipneighbors.com/

http://www.linkvendor.com/seo-tools/domains-from-ip.html

http://domainbyip.com/

@moozeek - none of those sites you linked seem to be anywhere near as accurate.