I'd like to throw my hat into the ring here.
For me Javier Pastore has sold out. People can say that Tevez sold out, as did others like Silva and Balotelli, but with those players they were joining a team playing in the best league in the world on rankings.
Pastore has moved from the 4th best league in the world, to the 5th best league in the world. PSG didnt even qualify for the CL so you can tick that one off the check list. Yes PSG are showing ambition by signing some like Javier, but its not PSG's amibtion we are talking about.
While the above mentioned City players moved to a team also in the Europa League they were still either staying at the best league or moving to the best league in the world. Tevez (United 1st to City 1st), Silva (Valencia 2nd to City 1st), Balo (Inter 4th to City 1st). Those players and others for City have tried bettering themselves, and while money no doubt played a part, ambition would have been a high priority too.
On the flip side, Javier Pastore for me has shown a complete lack of ambition and i feel we have dodged a bullet in not signing him, as can Chelsea fans especially. Pastore will now go on to become one of those players people will talk of as a great player, without having really done anything in one of the top 2 leagues. He will rot away in France like a block of Brie swetting in the Nice sunshine.