I don't think senna brings in that much money, certainly not enough to keep him on next season after how bad he has been so far.
Edit: Why would Kovalainen leave f1? I thought there were rumours of him joining a better team as he is too good to be stuck at caterham.
think again
These days, outside the leading teams, drivers are being asked to pay for their seats with lucrative sponsorship deals.
Top of the list is the Williams driver Pastor Maldonado, who is worth an estimated £45m to his team because he has the backing of Venezuela's national oil company, PDVSA. Maldonado is a friend of the Venezuela president, Hugo Chávez. And he won just one point last year.
His team-mate, Bruno Senna, has a wonderful name but not quite as wonderful as the £12m he brought to the table in the form of Brazilian sponsorship, headed by the oil giant Eike Batista.
Another old hand, Jarno Trulli, lost out at Caterham, when the team that was formerly Lotus brought in Vitaly Petrov, who is backed by a number of Russian companies, including the petrochemical firm Sibur, to the estimated merry tune of £12m.
Sergio Pérez signed for Sauber clutching a bag of Mexican gold, courtesy of Telmex, and down at the bottom of the paddock HRT have Narain Karthikeyan and Marussia have Charles Pic, who have both brought in about £5m. Pic's wealthy mother owns an estimated 6,000 trucks in France.