Because typing sucks, more on that later.
Instead, a grammar rant:
Cliche is a noun. It refers to "a phrase or opinion that is overused and betrays a lack of original thought."
Cliched is an adjective. It describes something that is overused.
In other words...
- The jokes in the last episode of The Simpsons were tired and predictable, to the point of becoming cliches. D'oh!
- So many people imitated Lucille Ball's style that it became cliched.
Incorrect (oh, so incorrect that it makes me weep for the English language):
- Apple's style is becoming a bit cliche. (Quoted from macrumors.com.) You meant cliched, as you're describing the style.
Also? "Nitsche" is not the term you were looking for when describing a small, particular market/audience/fandom. You meant niche.