It's everything wrong with paying own money to make car, which is often chosen for handling as driver's car, handle worse, for sake of arguable change of looks few if any but owner will notice, and probably guided by several misconceptions. Things "gained" with staggered setup: inability to even out wear by rotating wheels, limited tire choice that has both sizings available, way more understeery car, twice harder to find/source single replacement wheel in case of damage, harder to find buyers for staggered wheel set later on. And as one of reasons to go staggered was probably to fit widest tires one can, not only car will loose playfulness, but tire cost probably also will be doubled.