Well, if you look at the intent of the rule, it's put in because a "must have" product seems like a no brainer to buy, which gives almost guaranteed profit. If there already is a king of the hill, then it's no longer such a guarantee and thus no benefit to building something that would have been indispensable in isolation. This doesn't mean your product can't succeed though, it just means that you don't have that landslide advantage.