If the players want to move from UEFA leagues to Saudi Professional League, then they have solid reasons to do so. I agree that money is definitely one of the considerations. Obviously in the recent past, UEFA clubs used their deep pockets to steal American, African and Asian players. Now Saudi Arabia is giving them a taste of their own medicine. Overall, quality of football in UEFA confederation is on the decline (would make an exception for France and England). And once the star players depart from their leagues, the quality will go down even further.
Players must be good enough to catch attention of clubs in Saudi Arabia and receive good offers from those clubs. If they are normal, poor quality players in Europe, chances for them to receive overpaid salary offers from Saudi Arabia is slim or impossible.
I don't get reasons to feel jealous with them as at least they are good players and have quality to contribute for their clubs on field and they also have ability to create effects in marketing aspect too. No doubt about marketing effects from Cristiano Ronaldo or Karim Benzema as they are super star players. For other players, they actually contribute good quality performances for their clubs in Saudi Arabia.
We have seen some notable transfers from the Saudi League this season. Various clubs in the Saudi League have signed contracts with players like Neymar, Karim Benzema, Yassine Bounou, Sadio Mané, Roberto Firmino, Fabinho this season. After successfully making these transfers this season, various clubs in Saudi Arabia offered big European stars for some more transfers, but they did not succeed in bringing those players to Saudi Arabia.
Bounou would have not received offer to move there if he had not played well for Morocco in World Cup 2022 and for Sevilla in Europa League last season. Similarly for Brozovic with good performances for Croatia and Inter Milan. Mane, Firmino and Fabinho are famous players in Premier League so they are not surprising transfers to Saudi Arabia.