How can Red Bull afford all advertising?

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For a while I have been wondering, how can Red Bull afford ALL their advertising? Now days it feels like there is no sport star without a Red Bull logo on their clothes. Red Bull does also have alot of competitions, like Red Bull Air Show, and that cant be cheap. Of course, Red Bull isnt so very cheap and I think many people buy it, but the return cant be so big with all this advertising but what I know it is pretty big.