The book I wrote in May/June just crossed 500$ in sales.
I put the book on Gumroad first as this was the easiest and cheapest way to share my work with the rest of the world. It had some success and I decided to explore other distribution channels. I read good things about Amazon KDP so I gave it a try and published the book on Amazona as ebook and Paperback on 11 August.
Here the Pros and Cons.
I was not even monitoring how the sales were going until 2 days ago when I got a surprising email from Amazon saying that some funds were on their way. Hurrah!
In the end I managed to sell enough copies to cross the symbolic 500$ mark and more importantly reached people from all over Europe, US, UK, Brazil and Mexico!