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Just always pushing himself playing in top leagues, trying to score 1000 goals. It reminds me how I focus on getting with a hot girl I know just to motivate me to losing weight at the gym every 3 months.
No idea why Messi didn't join the Saudi league, could have got incredible pay. Seems much more competitive than playing in America. Maybe he just couldn't be assed and just wanted to take it easy before moving to PSG.
Because him and his family preffererd to live in the USA, more precisly in Miami. At the same time he just want to at least try to keep fit to continue playing with the NT. His move to the USA gives him another level to his fame as one of the faces of football in the biggest market of the world. This will cemented lots of kind of bizzness in the USA for years to come, from adverts, to buying Clubs, invest in Hotels, agreements with Apple and such. That's the real bizzness behind his move.
Saudi would have been just for the obscene ammount of money he woudl have get, yet more than probably Antonella and co would not like to live there and he already has enough bucks no matter how Corporate he is, in order to choose another path to continue earning his whole life when he retires from football.
Strict football I would have preffer a couple of seasons more in Europe and now (or even a season ago) in Argentina or some mid table or low table project in Serie A like COMO. Yet that woudl have render his whole USA move unexistant and not even just him, his Father more than probably wanted such move.
PD: Going to Saudi or USA ain't a challenge at this satge of their carreers in comaprison with what they've done, no matter how anyone rate either Leagues and of course being a "challenge" none the less within the respective enviroments. Both are just closing their carreers and mostly try to keep themselves fit and earn or create new bizzness opportunities, of course as any League it will still be a challenge to win a title, being as they are they will want to win, but it's not like a fella from Sporting trying his luck in Man Utd or a kid from Newell's trying his luck in Barca, those days are gone and neither ever need to be in a particular place to need a desire to win whenever they are.