Lizzie led me to this:
There is an explanation on how this value was derived, but it involved tables of numbers and I didn't feel like studying it. I'm guessing most of my blog wealth is due to the links to Amazon that I employ on occasion.
Speaking of which, someone actually clicked through an Amazon link on my blog and purchased a book! This earned me a whole $0.79! Yes, that is right, 79 cents. On the one hand, I am very cynical about how blogging is promoted as the next get-rich-quick scheme. On the other, I AM SO EXCITED! THANK YOU, WHOEVER YOU ARE (and you know who you are)!
Now that the bait has been set, I just might add Google Ads. The only problem is you don't have much control over which ads Google decides are appropriate. On one knitting web site, the ads were for needles - not knitting needles, but hypodermic needles. I'm sure some knitters need both, but geesh.