When you convert profit to fiat or Bitcoin, it is always much less than 20% and often be a negative amount.
That's certainly true, mate. For what I know, current stake rates are just an estimate. You'll earn a lot less with exchange fees and built-in network fees. I'd prefer to stake coins with a low APR, as the risks are lower. ETH's rates seem steady enough for the coin to maintain its price in the long term. The higher the stake rates, the greater the inflation for the underlying cryptocurrency will be in the long term. This translates into less market valuation the more coins are minted on the Blockchain. As long as ETH keeps rates considerably low, there should be nothing to worry about.
Nonetheless, I'm convinced enough to go all in ETH staking for the long term. Thanks to Dogecoin's astronomical rise, I have obtained the required ETH amount to become a validator. It's much better to stake on your own than leaving your coins to a staking pool. Not only the risks of loss are reduced, but you also contribute towards the decentralization of the Blockchain network. If ETH continues to go up in price, your staking returns in terms of Fiat will increase by a large margin. It's a win-win situation for both the Blockchain and the validator itself. Just my thoughts