Because he played 30 odd games in La Liga last season and was apparently in great form.
Man Utd don’t have many players worth that? Which ones do you reckon you’d get for less than 30 million? I can’t think of many despite them being really poor last season.
As crazy as it seems to fans of clubs at our level, 30 million isn’t really out of the ordinary at that level anymore. He’d probably be going for a lot more if it wasn't for his ‘problems’.