Ive no idea.. however merchandising alone can bring in substantial figures..
Take Madrid for example with Beckham.. the amount of money they made from merchandising alone in respect of Beckham was quite decent..
Again Madrid bought Bale with similar ideas in mind....
Great players Market your Brand and therefore make the club money...
They also help to attract bigger and better sponsors for your club...
Buying Bale was nothing to do with merchandising.