If it was only for the money, he'd leave last summer.
He wants the Ballon d'Or and has said this multiple times. He's just looking for a team to help him get it as soon as possible.
As for Manchester, I read in an interview before the Euros that he said he missed the city and his friends there. He also said he goes out in Milan, Turin is too calm for Pogba.
He's a young star, he craves the spotlight. He's gonna get the money anyways. It's Raiola who's in charge of the money and the one who craves it above everything else, but he still looks out for his players, makes sure they develop properly and in the right surroundings so he can cash in on them later on.