Current rewards for staking look like they're around 7.5-8.5% APR. Above numbers that comes out to ~$4k/yr. Paid in ETH so that would vary with price fluctuations
You beat me to the math, but yeah. You also have to factor in taxes so reduce that by ~20%.
But I'm not staking until the conversion of ETH 2.0 is done. After this July, I expect the price of ETH to go way, way up. I also expect the rewards for staking to go up as ETH moves to full PoS . I think it's totally reasonably ETH gets to 100k a coin with staking rewards at about 10% within the next couple of years. If you think that seems high, look at BTC and consider ETH has been significantly outperforming BTC for more than a year- and that's BEFORE the ETH 2.0 changes, when ETH becomes much more scarce and much more valuable (see recent posts about ETH PoS).
If you go with the nice round figure of 100k per ETH and 10% staking within a couple years, you would be looking at roughly 100k in passive income per year if you have 10 ETH. Take 20% for taxes and you're looking at ~80k per year, paid out monthly at around $6,700/month, after taxes. Even factoring in additional taxes or lower staking rewards, you are looking at a sick amount of passive income per month.
A lot of people much smarter than me think that ETH will be worth significantly more than 100k per ETH over the next few years. As ETH goes up, your monthly passive income goes up. The numbers are understandably difficult for a lot of people to grasp, but really if you look at how BTC has performed, you already have a prototype for what to expect from ETH. And honestly, I expect way more from ETH than from BTC for lots of reasons already discussed. Literally, EVERYTHING is being built on ETH (look at the recent Visa news).
If DeFi actually gets adopted by a large percentage of the world (which seems very possible to me), ETH at 1 mil per coin isn't unreasonable. If that were to happen, your 10 ETH would suddenly be worth 1 mil a YEAR in passive income (at a 10% stake rate).
Again, the numbers and timeline is probably a little optimistic, but not outlandish imo.