In the UK, I’ve had a cheap HP printer for several years, with their subscription, which delivers ink cartridges when needed. It’s free up to 15 pages per month, at which point I believe it’s £1 per 10 pages, ad-hoc. I very very rarely print anything so virtually every month is free. And the couple of times I’ve had to print more than 15 pages, I’ve paid the £1 and that was it.
It works perfectly for me, but if they tried to pull this same $7/mo minimum here, I’d ditch it immediately. I’m not paying $84/year just for the few times a year I need to print something.