"What home users are motivated to buy enough ink to print a bunch of pictures every 2-3 weeks just to prevent clogging?"
School age children and their parents.
I bought an (inkjet) printer because the kids asked and asked! They needed a lot of prints for their school and activities. We use it constantly now that we have it, for many home and family usages where color is often needed (but not always). We have an ink subscription because it’s much easier.
When I was younger I had advanced inkjet printers for creative uses, arts, etc., but then entirely stop using one for years, until… kids.
Color printers are niche now, but for some segments of the population still very much needed.