I'd say most buyers care about looks and comfort, with reliability and features next. Of those buyers who care about performance, most just want _some_ performance (i.e. having a bit of spice). If you're getting in the real performance space, things like solid corner handling and engine behavior when going all-out, you'll have lost most people.

You can add a lot of spice by propping up the care with some nicely tuned turbo, pedal behavior and cooling that is sufficient for just a few accelerations. Most people will never find out the difference.