I’m guessing this is what attracts the manufacturers though…
“The global advertising value of Mercedes’ television appearances during its F1 campaign in 2014 was $2.8bn (£1.8bn).
Experts believe the equivalent value for VAG of their sportscar and touring car programmes was about $30m (£19m).
Mercedes spent a net 130m euros (£103m) on F1, once external sponsorship and prize money is taken into account. VAG spent about 320m euros (£254m) on DTM and sportscars.”