why is that? let me guess

gradually VW will give away 3000 wroth gift card.

then solution comes out: update the software, but it will consume more fuel, and little worse performance; you are not happy with it? ok you have second option, we will buy back your car in 1000 dollars higher than market price, but you will have to pay me back these gift card you have accepted. then majority of 482000 owners will retain their vechiles...