Can I point out that we would be very unlikely to get much above £30 million for him.
Firstly his contract is running out, and any club would know that in 12 months time they can get him for absolutely nothing. All they would have to do is offer a huge signing on fee if he agrees to commit to them ( all under the table of course ) and he costs that club not one cent other than what they pay the player as a signing on fee.
Secondly his form has been so poor, that no one is going to pay top whack for a player that looks so out of sorts.
Finally, and this is a cruel reality. Clubs know that one way or the other he is wanting out. They wont pay over the odds for a player that really doesnt want to stop at the club anyway, and has shown not once, but twice that he is open to just deciding one morning he doesnt like it and wants out. Would any club pay £70 million for a player that could potentially in two years time turn up at the doorstep and say "sorry, I've had enough I want a move"
Rooneys track record will also be taken into account, and given the way he left Everton, and now how it appears at United, no club is going to be 100% sure that he will see out his contract.