Look at their graduates who have come through and are regular starters. Valdes, Iniesta, Xavi, Pique, Alba, Puyol. Out of those, who has left or (is likely to leave) since becoming an integral part of thier play. Alba and Fabregas left Barca at early ages so they could get regular football at their age while Pique left due to limited opportunities but now is a regular and will finish his career there but Busquets is in the same category as Xavi and Iniesta and the rest mentioned. He has established himself as an important player them and there is no way he is going to leave. Barcelona and Busquets are probably just laughing to theselves when they see rumours linking him to City and Chelsea.