As Greenie stated, build them for your own network of sites. You do not have to follow rules but I tend to keep the ones I do very close.
I had 2 of those that were first page at yahoo for a month. Just checked and they are now on page 2. Plus sometimes I can get more hits to these from my own network than I can from smaller lists so I think they are worth it. Just my 2 cents.
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