I don't remember a time when we did not have a kasambahay.
Growing up in my grandparents' house in Zamboanga, we always had kasambahays who helped my Lola cook and keep house. The kasambahays were usually distant relatives whom my grandparents were putting through school, or non-relatives who offered their services in exchange for the chance to go to school. I'm proud to say though that unlike Lola Pulido, my grandparents never treated any of their kasambahays as slaves since aside from schooling, the kasambahays also received salaries.
My aunts also took on this practice and would accept young girls as kasambahays precisely because they wanted to put them through school. I don't remember my own parents doing this though, but that was mostly because our own kasambahays were already in their 30s or 40s when they would go to us.
I have my own kasambahay now who not only looks after my son, but also cooks and cleans for my small family. So yes, having a kasambahay has always been my norm. But that's not to say that I've never felt unease over it.