Yes, well that clarifies things. That reason makes perfect sense to me, in fact I do something like it at times myself.
I've built two versions of many sites, on two seperate folders, one with dmoz grade advertising (a console and a fpa), one with the fussier linklist grade advertising.
Neither consoles or fpas are as efficient sales tools as they once were, so I do it less these days. You have to build variations between the two sites or google will tend to devalue them, thats the reason I don't do it so often these days, better to concentrate my work on one optimized site. (and dmoz isn't so important these days.
Anyway, that is a decent reason to want to conserve an index.
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