I am not forgetting taxes, just like I am not forgetting various other expenses or other income sources that guys might have. As we know some expenses and even some income sources are necessities and some are discretionary and some fall in a kind of middle ground.
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In regards to taxes, specifically, Capital gains taxes are 15% in some jurisdictions, which tends to be less than regular income taxes, and presumably if you have a cost basis, then the whole $80k per year would not be profits (most of us are not that lucky in terms of our costs per BTC).. and I hope that guys should already be accounting for a variety of those kinds of related matters when they figure out how much they need per month to live and how much of a float they feel that they need (including that the amount and the float will likely change from time to time, too).
just my quick 2 cents (sats?) on taxes. when i cash out to an amount of fiat i need for some project or another i cash out an extra 20% or so and put it into a bank CD or something safe like that (as fiat of course). that way if the price craters at least i have the fiat to pay the irs when the piper calls. hoping the price holds or increases until tax time is not a very good strategy imo. of course if the price goes up i left some profit on the table but the alternative if the price goes down is.. unpleasant. one does not want the irs as an enemy.