Of course you don't HAVE to relent to a player's wishes if they are under contract, but it often makes good business sense to do so. Football clubs, whether you like it or not, are businesses first and foremost. That is the reality. If fans want their clubs to ultimately be successful, they must accept that they have to be run as a business in order to stay competitive in the long run. Let's take the sale of Murphy as the most recent example. What did we pay for Murphy? £150k? We got a minimum of £1.5m for him, as well as two and a half seasons worth of game time. That to me is good business, particularly as it leaves room for the likes of Ché Adams and our other youngsters to get more game time and bring on their development. Would we have preferred to hang onto Murphy? I think most would have liked to have him for longer, but he had decided that he wanted to progress to the next level. Fair enough.
To refuse a player's transfer request impacts on his happiness, which will affect his performances. It can also spread to other members of the squad, which impacts on team performances. If they are not performing as well, their valuation goes down, meaning that if and when the club finally decide to get rid, they will get less back than they would have had they sold the player earlier. It's bad for the player, it's bad for the club. Contrary to what many United fans seem to think, the board are not idiots. They are businessmen, and that means keeping the long term view firmly in mind when making decisions, such as whether to sell a player or not. Personally, I'm happy to leave the people with access to all the information (such as Jim Phipps) to make decisions as best they can. It's their job to ensure United are successful ffs, they're not trying to fail! I'm so fucking fed up of Blades who jump on their backs at every opportunity, when they know the square root of fuck all about what really goes on behind the scenes.