The global viewership and commercial interest in the top few clubs massively outweighs the rest of us. Without them there is a fraction of the interest in these competitions.
These clubs know that and will use it as leverage do get concessions. Luckily the 2/3 majority vote rule in the PL has...
What's interesting is a few highly publicised cases of disillusionment with Saudi league.
The previous workaround for FFP - sell your has beens to Saudi for big bucks - doesn't work if the player won't go.