If we all woke up with $417,465 tomorrow, we would instantly be broke

That's not true, though, fully equal wealth redistribution does create an incentive problem, but tax based redistribution, such as UBI, allows for ROI and Return On Time/Work. It's fair that the slaver class must pay more for work if the structural desperation of accepting slave level wages is eliminated, but there is direct economic growth from UBI/tax redistribution, from higher money flow/velocity, and so Return on slave's work can be positive, and certainly, the slaver/capital class still has all income/wealth trickle up to them.

I wouldn’t mow your lawn for $20

You might like me, or like society enough, to help me/society for a fair price. You don't need to travel far if you're my neighbour. The $20 might be equivalent to a few beers. But even if you will only do it for $40, that is more beer sales, and more brewing workers/income, and more demand for lawn mowing.