But is this the exception and not the rule? This has been said in numerous threads in one form or another - never assume about your visitors. Like sooooo many things, a seller has to "think outside the box" when it comes to promoting sales, or a product.
If you study every popular whatever, there is something unique that makes it stand out: myspace, iphone, google, etc. They all provide somthing the others don't. It's that "others don't" nitch you should be looking for.