300k is laughable. 2-3M is a more plausible figure if you want to finance two people purely off passive income.
Like, you're under 133% of the poverty line, so you pay no more than 2% of your income on health insurance premiums.
Plus if you manage your income to stay under ACA subsidy limits, you're generally going to be paying a higher effective tax rate by forgoing tax-deferral opportunities at higher tax brackets in your income earning years or Roth IRA conversions to use up lower tax brackets in your post-retirement years.
So yeah, it's a pretty big loophole.
I'm slowly accumulating my QQQs and SPYs and will probably stop it at a similar amount.