I would argue that the case market is not a niche market, but the stylus market is.
You might be interested in these Kickstarter projects, if not aware of them already:
http://www.kickstarter.com/projects/jonatherton/jaja-worlds-first-pressure-sensitive-stylus-for-ip
http://www.kickstarter.com/projects/ipen/ipen-the-first-active-stylus-for-ipad
You might be interested in these Kickstarter projects, if not aware of them already:
http://www.kickstarter.com/projects/jonatherton/jaja-worlds-first-pressure-sensitive-stylus-for-ip
http://www.kickstarter.com/projects/ipen/ipen-the-first-active-stylus-for-ipad
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You could say that about cases too, but Apple came out with their own Apple Case.