You would think that his agent would have been shrewd enough to include a buyout clause in the new contract and at the time, 50m would have seemed about right for both parties, I would imagine. So that might be where this number is coming from. Obviously, the way he has started this season, that now seems a bit on the low side but nobody could have known that at the time.
I try not to worry about these things. Players come and go and you can't blame them. I look at it this way. Every player leaving presents us with an opportunity to find someone even better to take their place.
and well done to Dom for doing enough to attract the interest !