buying and selling rETH again for ETH is simply doable in the event the staking liquidity pool has plenty of ETH in it to handle your trade. This really is Rocket Pool's pool of ETH that arises from two resources:
If https://dev.to/cleopatramorris_d539d19ea/rocket-pool-the-future-of-decentralized-ethereum-stakingintroduction-1m2b