from the latter circumstance, they might get paid a Fee from staking ETH and receive supplemental RPL benefits from offering RPL collateral, amounting to nearly 6.36% APR for ETH and the additional RPL rewards.
Rocket https://dev.to/cleopatramorris_d539d19ea/rocket-pool-the-future-of-decentralized-ethereum-stakingintroduction-1m2b