There are a bunch of shows that can be seen as rip off or copycats but here some show that could be seen as rip off but changed enough to be its own thing kinda off.
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History Channel's Top Shot (Survivor with Guns)
Bravo's Platinum Hit (American Idol meets a lame version of Top Chef)
FOX's Joe Millionaire (The Bachelor but less boring and with more slurping)
VH1's The Surreal Life ( The Real World but with Z-list celebs )
EVER PAWN SHOP SHOW (I don't care who was first they are all awful and this list would be full of them)