On a serious note, I really rate Benatia. I really want him to stay. He was one of the best, if not the best, defender in the Serie A. Now I might be biased, but the £40M price tag is justified. If Luiz is going for some £50M and Mangala is going for £30M+, Benatia should be worth around £40M.
I want him to stay, as I said, but I'd rather sell him then have him stay and have him play like ****. He apparently did that in his last year with Udinese and I would hate if it happens this year. We need all players to give their 100% if we have to fight Juve for the league. On paper, our team is just as good as Juve's, we need the will power now.
Man United is a 'dream come true' for many players. You are playing in a top league, for a top team. I don't believe that the destination is not as attractive for players due to them finishing 7th (and not playing the CL). Their manager is Van Gaal, who has played in the biggest stages. If he believes in the project United are doing, why wouldn't a player believe in the project?
Benatia has made it public that he wants an improved contract. Apparently, he rejected higher pay checks (like Napoli and Juve) because he had a verbal agreement with Roma, but there was a verbal agreement that if Roma do well in the season (Champion's League qualification??) he would get a pay rise. Roma have offered a pay rise but not as much as Benatia wants. Roma claim that the rise is as much as was promised, and offering more will start a chain reaction where other players would want a rise. On the other hand, Benatia feels that the offer from Roma is not good enough.
If any club is ready to offer £40M for Benatia, I would sell. Yes, we are losing a MASSIVE player, and the potential replacements are nowhere as good, but why keep a player when you risk him playing like crap and losing £10M+ value in a year (and potentially titles). I've seen all Roma's pre-season games, and he has been ace. he played well against all teams and looked very determined. Not sure if this determination is to impress other teams (United, Real Madrid etc.) or because he really cares about the team.