If they sold refills at all, then the camera wouldn't be disposable, so unless this was some sort of joke...
http://en.wikipedia.org/wiki/Razor_and_blades_business_model
Don't forget the more modern varients: PC/Internet and Cell-Phone/Calls
Of course, after five dead inkjet printers (HP, Epson, Lexmark, HP, Epson) I finally got pissed off enough to refuse to buy another one. Ever. I bought a networked Konica Minolta color laser for about $800 six years ago, or so, and it's served me well ever since, and cost less than another five inkjet printers and their outlandish ink prices. I've only had to replace one toner cartridge (black) in that time, and I expect to get another few years out of the printer. It also has Postscript support, so I don't have to think about drivers (which is irrelevant to some folks, but I never want to spend an afternoon fighting with printers again...and a networked Postscript printer is the only way to guarantee that I don't have to).
When my dad started talking about buying a new inkjet after his third HP started banding badly (and new cartridges, and cleaning, didn't fix it) I bought him a $200 laser printer. Best $200 ever. I buy him a new toner cartridge every year for Christmas...it's held up great for three or four years now.
I recently bought an HP D2400 printer at Big Lots for $30. The color/black cartridges come out to around $40. Go figure.