One thing I've come to realize about Ronaldo, and it's a little sad. Growing up as the poor kid in his Madeira neighborhood, money still seems of utmost importance to him for how he values himself. Or at least as much as the trophies and the individual awards.
That his trade dealings as he's aged have continued to follow the highest bidder, even if he has more money than God now, seems to suggest money is highly tied to his self-worth.
Which means no chance in hell he's going anywhere that isn't going to pay him stupid money (certainly not a return to Sporting CP, where he could have continued to pursue CL scoring records).