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OP's scenario is further complicated by the fact that his wife is (presumably) half supported by himself who (presumably) is earning a living.

So... How many single people earn a living, pay rent, bills, feed themselves and live to an acceptable standard from selling Hamburger ebooks?

I don't know about hamburger ebooks, but the guy who runs parrotsecrets does make more than most computer programmers.

Also don't forget that you don't have to live in a rich country for you to sell ebooks. Anywhere with internet is fine.