English native speaker here: "How much do you make" is pretty much always understood to be talking about financial earnings, unless you were specifically talking about pancakes or toy cars already... and even then I would probably assume someone was asking how much money I make from selling my pancakes or toy cars. Additionally, for it to be refering to something else, the question would almost always have to be "How many do/did you make?", since most things are countable nouns, unlike money which is classified as uncountable and therefore uses the question word "how much."
I don't know about other countries, but here in the United States people will go on public television discuss family fights, sex and and other private aspects of their personal lives. Ask them about what they earn and they act as if you implied they were born illegitimate. It never ceases to amaze me that this is the most private aspect of their lives.