It's the same interior as a $45k Corvette which is 8-9 years old to begin with. Significant redesign was not feasible, especially coming out of bankruptcy. Other cars like the Mustang start with $20k interior and move it upstream to the $55k GT500. Yes, it gets better seats, but the dash, console and door panels all remain the same.
For comparison, the "better" interiors on sports cars start at a much higher sticker. Take a Porsche Boxster S or Cayman S which have a $15k premium over a base Corvette. I'm not sure I see the value in paying that premium when the interior is functional for daily driving. Being both a Lotus fan and motorcycle owner, why is interior on a sports car such a big deal to you? I can understand on a luxury car like a Lexus, but the Vette has always focused on performance first.