Correct, but it is a two-way benefit. No doubt, Cristiano Ronaldo accepted the offer to play for the Saudi Arabian league for money. If they had offered him anything less, he wouldn't even think of playing there. However, it is also that the Saudi Premier League needs him to play for their league. This will give a lot more popularity to this league when you know the big names are playing there. Anyway, all this is possible because the Saudis have a lot of money to bring football home. They are also the hosts for the 2034 FIFA World Cup. 
Money is one of the biggest motivation for players to join Saudi League with here they are having less stress than UEFA this is second motivation for them staying in UEFA need more competitiveness and fitness here in Gulf region situation is completely different.Most of the players those crossed 32 to 35 have good time for cashing out themselves Saudi League needs some big names as this is helping them for having increase in fan base and also giving them good name in their countries because this will increase their media engagement as well. Even they have their best achievement through their investment now hosting rights of FIFA World Cup 2034 now need to stay on good level until this event in soccer league surely give them good chance of keeping themselves in soccer world at better level.
If it was about less stress, the best way for them to continue and finish their career would be the MLS instead of the SPL. The SPL is only about money and nothing else.
When someone gets an offer from Inter Miami and can choose to play and live in Miami compared to Saudi Arabia, I think most players would choose Miami over Saudi Arabia, but the amounts of money that the Saudi Arabian clubs can offer make the difference.
In special cases like Messi, they have set up specific arrangements with broadcasters and sponsors that ensure Messi will make hundreds of millions regardless of whether he goes to Saudi Arabia or Miami, but it is not the same for all other players.
For a European or South American player it can be quite burdensome to live in Saudi Arabia and not have the culture surrounding them that they are normally used to or got accustomed to over time.
I guess most people would not say no to a contract that makes them as much money in 2 years as they have earned in 10 years before that.