my kids enjoy sitting with my mum and looking at old family photos in a photo album.
I've used photobox to make photo album books from digital photos as it's nice to have and hold, and easier to flick through them.
I think it wa 7 day shop were still selling film, but it was very expensive, as you say, I don't think you can just take it to the high street now and choose who has the best deal to get it developed, or send it off to one of those companies which returned your photos weeks later with a "free" film
My mum had a Polaroid, didn't use it much as cartridges were so expensive, was saved for special occasions, on holiday abroad where she wanted to be 100% she had that photo of that special moment