In the latter case, they might make a Fee from staking ETH and gain added RPL benefits from providing RPL collateral, amounting to nearly six.36% APR for ETH and the additional RPL rewards.
As is very distinct through https://dev.to/cleopatramorris_d539d19ea/rocket-pool-the-future-of-decentralized-ethereum-stakingintroduction-1m2b