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But if everyone did it, they would have too many links on the page to maintain that PR power.
Those are also pages that are hard to get on, and the sites that they point to are regularly monitored. I don't think a bait and switch would work for you here.
This is the problem. The only ODP pages with a high enough PR to do this would be the top level categories. Basically, the only sites that are going to get listed there are large, definitive and authoratative sites on a broad topic. Obviously, creating such a site to get listed in these ODP cats would be a massive undertaking.
Is this correct and if so why aren't we all submitting these sites to Dmoz and then linking them to our commercial sites?
Here is another little thing for you to consider while you are doing that. You will not be able to pass very much of that PR7 from your non-commercial site to your commercial site unless you jump through all sorts of JS hoops to do it.
Doing this would actually be counter productive if you were to create a site that is worth placing in a PR8 DMOZ category.
I actually think that you should try putting together an authoritative site that you could get listed at PR8. It would be a great addition to the web, and you could skim off a small percentage of the PR that that site gains over time to push to your other sites. If you are too greedy, it will all blow up on you.
And while you are at it, make sure that your commercial sites are worth listing at the highest level possible in DMOZ. But just like in Google, don't spam them, some of those editors have a long memory that is helped out by the editor software.
Actually, you could if you added the commercial link to the home page (such as listing this as the "site sponsor"), and had just a few links from that to the internal pages of this authoratative site. However, the amount of effort it would take to create such an authoratative site for the sole purpose of getting it listed in an ODP PR8 cat and to link that to your commercial site would make it not worth it. He's thinking along the idea of an "easy way" to get high PR. This way sure as heck ain't easy.