What Is the Primary Revenue Source for Validators in a PoS System besides Transaction Fees?
The primary revenue source for validators in a Proof-of-Stake (PoS) system, besides the transaction priority fees, is the issuance of new native cryptocurrency (e.g. ETH) as a staking reward.
This reward compensates validators for their service in securing the network, proposing and attesting to new blocks, and maintaining network consensus. This issuance is often a pre-determined, algorithmically adjusted rate.