Polo and Fabia are not based on the same platform. Only Fabia IV will be.
Many teams are supported by importers or dealers. VW was not involved until now and that means that there is a large space for making new deals with VW dealerships.
The car is new and there is a lot more hype around it than about same old boring Fabias. The sponsors love attention You know.
VW has proven itself to be able to bring a winning car which means that there is a chance that the new car would bring an advantage over Fabia owners.
Škoda Motorsport is not the easiest team to work with. Maybe it's worth trying VW services.

