I think the red arrows give a 'Feel good' factor to the nation, quite apart from trade etc.
I first saw them at Filton airfield when they were flying Gnats & a few months later, I had my first flight in a Chipmunk from the same airfield.
Everything costs money, including 'Deal or no deal & Eastenders' but the red arrows are a British institution now. Beware of public reaction if anyone tries to get rid of them.