It's mostly still a hobby. I publish very few books and could do without being a "publisher". But being one allows me to exist in the official French databases where traditional bookshops can find my books and order with one click. Without that, they would have to search on Google, find a phone number or an email address, and they probably wouldn't even bother.

It's not a recipe for getting rich! But it works for me, (and costs almost nothing).