Yet they do:
Alvaro Negredo
Sold for: £2.25 million to Liga newcomers Almería in the summer of 2007 after scoring 18 goals in the Segunda Division for Real Madrid’s B team.
Buyback: £3.75 million, executed in summer of 2009 after impressing for Almeria with 32 goals in 73 games.
Sold on for: £11.25 million to Sevilla after spending just one month at Madrid. He thrived at the Ramón Sánchez Pizjuán, scoring 85 goals in 182 games. His form was good enough to earn him caps for Spain and even another big move to Manchester City where he spent just one season, helping the Citziens win the Premier League.
Esteban Granero
Sold for: £2.25 million to Getafe in summer 2008. Having spent the previous season on loan at the small Madrid club, the move was the obvious one.
Buyback: £3 million in summer 2009. Unlike Negredo, Granero played a reasonable amount of games for Madrid. Spending three seasons at the Bernabeu as a squad member (without ever really coming close to being a starter for Los Blancos).
Sold on for: £9 million to QPR, where he was even more underwhelming than he was at Madrid.
Samuel Eto’o
Sold for: £4.4 million to Mallorca in the summer of 2000 after spending half a season on loan at the Son Moix.
Buyback: There wasn’t a buy-back clause, as such. Madrid didn’t sell him with a buyback, instead they transferred only 50% of his economic rights to Mallorca, retaining a controlling stake in his future.
Sold on for: £16 million to arch-rivals Barcelona. In a stunning miscalculation, Florentino Perez declined to buy-out the remainder of Eto’o’s contract and instead decided the Cameroonian marksman was not needed despite his 40 goals in 79 games for Mallorca over the previous two seasons.