Earlier quoted context omitted.
So... help me understand why it's on the order of $20-30 (or more) in my grocery store or via well-known spice merchants online?
Just guessing that the price varies hugely depending on where in the world you're buying it. I'd expect it to be cheaper the closer you are to a saffron-producing nation. A bit like how, if you're used to how cheap avocados are on the US west coast, you can suffer from sticker shock when buying them on the east side.
Edit:
Seems like the top producer, Iran, does make 160.000 kg/year.
From the list I found online the sum of the next 9 countries is less than 20.000kg