I was at Silverstone a few years ago when the whole F1 train rolled in and set up camp. It's quite a spectacle and far exceeds the sort of expenditure that other forms of Motorsport put towards PR.
The one that impressed me the most is the McLaren Mercedes one, curved glass, no wonder they are reported to spend almost 40M on PR alone!!!!!
Renault setup is the pits, a bit like their cars.