That's a little disingenuous, you can't just use a raspberry pi by itself. You need an SD card, keyboard, mouse (probably), display (maybe could use a TV for this if you have one). It seems like it'd be at least $100. That's still not a ton, but for a family working a bunch of minimum wage or gig jobs it's not nothing.

edit: not to mention internet, router, wifi dongle or ethernet cord, etc.