There's a huge difference between climbing to the top and then instantly failing and actually staying at the top.
A full day in Top Grossing on the Mac App Store gives you something like this:
Ranks #10 to #20: at least $2-4k per day. Ranks #30 to #80: around $800-1k per day. Ranks #80 to #150: around $500-$800 per day.
All sums are after Apple's cut. They fluctuate a bit depending on the day of the week.
I make more than the mentioned $454 per day at ranks of around #200.
My revenue report from last year can be found here: https://blog.kapeli.com/my-year-in-review-2014.