The Saudi Pro League is a league that is not as big as the European Big League, but that does not mean that the Saudi League is a simple league because this league has very large finances and can easily recruit expensive players from the European League to improve the quality of their league and requires a lot of time a little bit so that the Saudi League can be like the European league by recruiting famous players. Over time, the Saudi League will become more and more famous and will be seen by many people from all over the world and eventually they will become a famous league like other European leagues.
Talking about Al Hilal, Al Nassr, Al Ahli and Al Ittihad, Indeed Saudi League this clubs that have good performance in the Saudi league and the best among them is Al Hilal who were able to collect perfect points by not achieving a single defeat in the Saudi League this season. Al Hilal is indeed performing very well and they really deserve to win the Saudi League title. Apart from Al Hilal, Al Nassr is also a club that has quite good performance but it is still not better than Al Hilal. Next season there will be competitive competition between the two in the title race. Let's see how Al Nassr can do it.
They are planning on spending a billion or so this season as well, obviously not just one team but more like all teams combined, which I think should make it possible for them get some more famous players. I think they are not going to keep it going, but a few billion a year cost until the world cup at Saudi Arabia, means that they are not going to really spend that much.
Look at Qatar, those dudes spent 200 billion and still had the worst world cup in history, that was a bad marketing move, they lost money AND respect, Qatar was seen as a much better nation before the world cup than what they are considered now. So, Saudis saw this and want to make it perfectly clear that they are going to be quite strong, and making football fame in their own nation will make it better.