Life-changing? No. But for a first effort at a self-published novel I've been quite pleased, and I beat my targets both for sales and pages read (the latter being how KU works out how much to pay you).
Between unit sales and equivalent number of copies read through KU (ie KU says my book is 1111 standardised pages long, so I divide the total pages read by 1111 to work out equivalent copies read) I'm looking at a shade below 2,000 copies since coming out in April last year.
I also ran a 5-day free promotion before Christmas and got around 2,500 downloads. I was doing it mainly to try to get more reviews coming in (once you hit 20 you start appearing in more search results, more than 50 and you start appearing in Amazon newsletters and the like), but have been a bit disappointed in that regard.
My face is tired.