Yep, money talks. City though were a club moving in the right direction. Players are greedy, but they will be wanting to play in a team that will be challenging for the title/playing CL Football. Utd finished 7th last season, and have their work cut out to make the top four this season, although I think they will. To be honest, players like Kroos, Suarez etc will be wanting to play in Spain before going to Manchester Utd. That may change within a couple of years?
A number of people in the press, both in Germany and England, stated that Kroos to Man United was a done deal as early as March last year. His close friends have said that he was openly discussing about moving to Manchester around this time, and when asked directly by the press, he used the opportunity to discuss about how the Premier League is a great league, and how he would listen to any offers to play there should Bayern continue to refuse him a deserved pay rise.
The key here is that he also said something along the lines of "But as yet, no one has offered me anything, so we wait and see".....
Kroos wanted apparently £150-200k a week, which Bayern couldn't afford with their already high wage bill. He would have signed for United in a heart beat had that money been on the table on a contract, and Guardiola also basically said " I cant keep him and we have to sell if he doesn't sign the contract". Bayern only wanted 18-20 Million at the time.
So after 6 months of waiting for United to actually offer him something, Madrid just went to Bayern "heres 25 million, give us his mobile number...." a contract was drawn up and there we have it.... bye bye Bayern.
Its said that the only direct contact with Man United he had was when Van Gaal called him to beg him to join United, who realising that Madrid had joined the party, suddenly decided to actually try to buy him.
Kroos wanted to be a top player at a top club, and be paid what he deserved.... he would have gone to Man United, but they buggered it up. Arguably, if Man United were willing to make him a top earner in Europe, he would have gone over Madrid, as he was apparently sick of playing in a Bayern team where his skills were underappreciated.