Depends on how much traffic to some extent. When your reach becomes so wide that the same surfer clicks on a different one of your banners, not realizing he/she is going to the same site then it might be time for a rotating host of tours. I don't see too many people doing this but the few times I have seen it done it worked pretty good. If the surfer didn't buy the first time, then clicks on another banner from somewhere else and gets a different tour the second time, then maybe they join.
If your exposure isn't that good, then one totally optimized tour with slight changes made now and again should hold up well for you for a good long time.
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Retired Pornosticator
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