I have started doing this now. However, isn't this something which eats into the personal-time of a person? Why should software eat my world? Assuming I do get

I have started doing this now. However, isn't this something which eats into the personal-time of a person? Why should software eat my world? Assuming I do get a good job now, I would be writing code for them, which most likely would be closed source. If I ever want to switch companies after a few years, should I start writing such code samples again? The thing which irks me most is when companies do not even bother to look at my profile without open-source contributions.