Bought him for 10, sells him for 40 four years later after the player has had a very serious injury, off the field issues and amidst doubts whether or not he will ever return to his absolute best.
Sure man, Beppe has been "found out"!
Also: Just because City goes nuts in the transfer market, doesn't mean that every club will.
At 28 years old and with 2 years remaining on his contract, Vidal's value is around 40-45 million.