Am I missing something or Rocketpool doesn´t make sense?

I was looking into staking with Rocketpool and I can´t figure the math on how can we actually get returns:

Amount to deposit = 4 ETH

Calculated Anual yield (~4%) = 0,16ETH

Fees to deposit = ~0,09 (~0,18 if you calculate also the withdraw).

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Additionally I assume the price of rETH and liquidity is not assured which adds extra risk.

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Can someone explain if I am missing something or this is just not worth considering?