The way that's worded tends to suggest they'd get a percentage of the profit above £7M, and £500,000 would be their maximum share. Which would equate to 12.5% of a £4M potential profit. Give or take.
Let's tell Barry to buy his contract out next summer and get him for nowt. That'll feck off MON for certain. We can always spend £3M and get Juninho in for a year or two.