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Thanks
Your question is hard to answer and I guess that's why nobody chimed in yet. You see, desiding if a dot-com is commercial or not can be difficult if you don't visit the site. I know of a bunch of dot-coms that are not commercial. I also know of a bunch of dot-orgs that are very commercial. Really difficult, however we had a few good discussions in the European Forum a while back:
Approximate CNO Domains Count For Europe [webmasterworld.com]
Approximate CNO Websites Count For Europe [webmasterworld.com]
That should help you to get an idea, but it's not the whole thruth ;)