I don't think it just about wages, or he would have been with PSG. They trashed him publicly.
He will get the 10mil a season from someone, I'd rather be Barca getting him on a free and with him motivated to prove France and PSG as fools.
The major reason Barca pays high wages because they have the most valuable and talented squad in the world. Run your club like Spurs and you can be outstanding if you keep making the screwed moves but never great. In today's world you better spend (fees and wages) like Barca, PSG, Manchester clubs, Real, Bayern. Big wages don't assure you of performance (United, Arsenal, Chelsea) but without it you are not going to be Europe elite. BTW Liverpool and Juve are just out of this group but top 10.
You are right. He wants his big money move (prerequisite) and if you can afford him, hé Will chose best sporting project.
PSG was very reluctant to give him those wages though. PSG agreed finally when he asked like 7 M a year.
Then, i think he got your offer when your delegation came in Paris Last summer and he asked for 10 M.
Again, Paris wasnt too happy to go that far but they gave in and everything was ready to be signed. Then, he betrayed us.
Turning point seems to be Abidal convinced him and at the same time, Paris punished him because he was late to training before Marseille game.
He didnt take it well and sided with his mom that wanted him to leave PSG.
Anyway, he had that idea to leave because there were talk he wanted short contract (2-3 years) to be able to discover another league later on.
Still think Barca has the best chance to get him. Unless a team able to get him now can pay the signing on fee on top of transfer fee.