I think a sell-on clause will be our best hope of long term cash. I think anything north of £500k will be seriously considered. At the end of the day, for a guy we bought for £30k 18 months ago, it's decent business.
Comparing it to a potential Ross McCormack transfer is daft. McCormack is a proven goalscorer at that level. A club at the top of the Championship will be willing to take that gamble. £12m-£15m will be worth it, if he scores the goals with takes that club up and earns them 10x that fee. See Jordan Rhodes for another example. £9m 'Boro paid for him six months ago. They got promoted, and already he'll be relegated to the bench now they've signed Negredo. He's served his purpose, and no doubt he'll be back in the Championship in six months on loan. Great deal all round for 'Boro.