They didn't cash in. Barca forced them to sell by paying the minimum fee release clause, which they legally have to include in the contract in Spain.
Buhuu. They could just offer him 3 x his salar and increased the realesefee at any stage they wanted. But No. They were greedy and clever.
Just pulling you leg mate. This is so way beyond disgusting behaviour that it is hard to believe. Still I find a lot of Barca fans, who supposed to been unfair treated by the "villains" in Madrid for 6 generations, are now just thinking this is ok.