Still, even at $10k it is absurdly cheap relative to the value generated.
spent three weeks getting the CSS exactly right
You'd probably knock something very similar to that out in two days, probably that functionally served the same purpose.
Panic and Co. would rather spend a LOT more time on it to make it beautiful and captivating to look at, then spend a chunk of change on a fantastic monitor to display it on.
This is why people pay for Panic apps.