Yeah I'm not surprised at all he wants out. Dude bangs 50 goals a year for a decade on 20m contract while the Neymars are on 80m, while scoring half that, and probably doubles that money with sponsorships and endorsements. And yeah money isn't everything but to be earning 30% of what worse players make is absurd.
The truth is if he played for big PL or LaLiga side he would already have 2-3 Ballon d'Ors, Bayern are amazing club but they're not very marketable and you need that big media machine backing you up to win these awards. Truth is he made a big mistake going there.