reputation is part of life; it's organic, and brutally desirable. You wouldn't be able to navigate life without heuristics to measure how much to trust something/someone, of which reputation is one crucial factor.
New/disposable npubs could still access certain service providers who opt to serve them via a prepayment, but prepayments hinder the effortless nature of the system I have in mind. and require a much heavier negotiation tax that would be overkill for npubs with a history.
We can do both, but the second system does not need to be formalized as service providers would coordinate (pre) payment out of band (you don't need to coordinate your relationship with your hosting provider (1:1) via nostr)