Depends on what your definition of 'fat' is....My definition is probably anything over 95 waist ie. Nordica W105 or Spatula. It's just not that uncommon to see a 85 waisted ski..
To answer your question, yes...most 'fat' skis rip. REX, G4, Pocket Rocket, Little Big Fat, Seth Pistol, Intuitiv BIG, K2 AK Launcher.....even the Line Motherships---i've ridden em' all and they all rip.
WIfreerider- where do you ski?? I really don't think it's that bad to have a fatty in WI depending on where you ride or where you travel to ride...know of LOTS of boys from Wisconsin that ride where I do that ski fatties (100+ waist INCLUDING the spatual). Granted they're not breaking out the fatties IN wisconsin, but that's not to say they don't own a pair...