My bet is if you buy a Dodge with the conductive mat or a piece of furniture with it that you would be willing to pay the $40 for a case to take advantage of the option.
The conductive technology can be integrated into a phone/tablet on the backside and not require a case. Although any case where the technology is integrated, inductive or conductive, you would have to buy a special 'pass through' case (or take it off) otherwise the contacts will be covered and unuseable.