Trading rETH back for ETH is only achievable if the staking liquidity pool has enough ETH in it to handle your trade. This really is Rocket Pool's pool of ETH that emanates from two sources: As Formerly outlined, rETH https://dev.to/cleopatramorris_d539d19ea/rocket-pool-the-future-of-decentralized-ethereum-stakingintroduction-1m2b