The thing about worth is it's simply an opinion. Especially when there's only one of that exact product on the market.
In Barca's opinion, the only team in the open market, he's worth 30 million quid. Personally, I feel he's not worth more than 40 million quid.
Look how many of you are banging on about how he's not won anything here, he's a cunt, he's not even THAT great, our players will be greater bla bla bla.
It's not Barca's fault that Madrid haven't come in for a bid.