Money is important The only thing keeping some of the players from top teams in top leagues after being offered huge amounts from Saudi leagues is probably because of their fame. Apart from that, only a few are about loyalty. Besides, most of these clubs already pay them well, it's just that another source could offer them even more, which would be tempting .

In football, most players don't value loyalty, just as most clubs won't value them anymore if they can't perform the way they used to before degrading,  they will only see them as liability and try to reduce their  wage/get rid of them somehow . So, I don't blame players wanting to look for more money, because sooner rather than later they will retire at early age compared to most professions, they make more money though but they will choose luxurious lifestyle anyways..