Where are you getting your info? A factory quality paint job with a color change including time and labor on a XF would cost at least 7-10K if you do it right, pull apart everything, remove engine, etc.

I am not trying to knock you or the plastidip too bad, because there are many times when it serves its purpose well, but for painting an entire car? It is a cheap way to drastically change something, not always in a good way, and that is why it is popular.