What do you think the big bar code is on the Ferrari car??? It's not there for them to scan the car at pit-stops, instead it's a Malboro advert designed to get passed the tobacco ad rules
Along with their own minor sponsors such as Mubadala, AMD, Acer,Etihad and also F1 sponsors that Bernie gives them concessions as well as taking profit to put on the car (Santander, Shelll, Bridgestone)
Also have you ever heard of Sponsors Premium with events???