the wife of a friend of mine works for the united nations and every few years the whole family is moving to a different post in a different country. because of the way the visa works in most countries, the husband can't automatically find a job in the new place, and so after they moved last time, after having a job in the previous country he felt exactly that kind of uselessness because he could not contribute. he eventually found a purpose in running his own startup online.

myself i used to earn a lot less than my wife, but i never felt useless as i see my purpose in contributing to society and i could always do that by working with FOSS. it is my work and my purpose, even if it doesn't pay.