They do it because they can. It's called competitive advantage, and theirs is being able to attract talent to the club.
It could be the down year you're hoping for but it won't be for long.
They've lost a tonne of experience for this season, and will be relying a lot on their kids. Difference being they're roosters kids.
Toia, Elliot, Salle Va'a, Foley, Steep, etc are genuine prospects for them, not just making up the roster. And they still have several spots to fill in their top 30 for 2025. One of them most likely for Manu when he comes back.