The money they've offered Messi can convince him to leave Inter Miami for SPL but he doesn't want to play in a league which Cristiano Ronaldo's the main player. Messi's the main player in MLS & Cristiano's the main player in SPL he doesn't want it to change.
I don't think that that is the reason and money is not everything. Messi's priority is to settle in a good environment with his family. Which is a better option, the United States or Saudi Arabia for rich people? It's hard to answer this question because everyone has different priorities. I would live in the USA because it's very rich, you can go in any state you wish and Miami has also been my childhood favorite place (Do you remember good old GTA Vice City?). I think that Messi prefers Miami for himself and for his family. I remember that he said this in one of his interview soon after winning the World Cup.
It's true that money isn't everything, and Messi certainly prefers his family's interests and comfort in America because the culture in Saudi Arabia is very different from that in America. And of course, in America, Messi still has a lot of money, and if I'm not mistaken, when he retires, Messi will be given a stake of approximately 7 to 10%. So, if Messi were to leave Inter Miami, it would certainly mean that he wouldn't receive that stake in the future, or even after he retires from football.
The point is, it seems difficult to bring Messi back to competing with Ronaldo. Messi's lifestyle is certainly different from
Messi'sRonaldo. Messi did a wise thing by choosing Inter Miami, and he certainly seems happy there.
However, we don't know what will happen in the future, and it's certainly not impossible for Messi to join the SPL. We'll just have to wait and see what happens, as negotiations are currently underway between Al Ahli and Messi's side. But, no matter what, it seems Messi will still choose Inter Miami.