Which is is such a high dollar count that this simply cannot be USD

So I haven't used Windows on my own machines in about 20 years, but back when I built my own PCs that seemed about right. So I looked up the price history, didn't realize that Microsoft reduced the license prices around Windows 8.

I remember 20 years ago, Windows XP Home was $199 and Professional was $299 for a new license on a new computer. Vista and 7 were similarly priced.

Since Windows 8, though, I just don't understand their pricing or licensing terms.