The next 2 years will tell us whether he's worth what he's asking. But if he just keeps plodding along like he has recently then his price will be clear. Needs to average at least 25disposals if he wants his price to go up IMO.
He's probably had his best year since being at the club this year. I would think that having disposal averages linked to financial contracts is a ridiculous notion. It would only lead to selfish behaviour and disrupt team harmony....