Turned off printers
This is never discussed. I had several Epson printers because they could be bought for a decent price, you could get cheap 3rd party ink and the print quality was excellent. Every single one of those printers (about 5 over the years) had to be thrown out because the ink dried up in the heads, to begin with you can clean the heads which uses about 25% of your ink. After time this becomes less and less effective. Sometimes the printer can be revived with cartridge flush. Eventually though they all become irrevocably blocked and not worth fixing.
About 3 years ago I bought an HP photosmart C5800. I use it infrequently, have never cleaned the heads other than when the printer decides to do this itself, and it prints as perfectly as the day I bought it. It's also extremely frugal on ink. My understanding is that the ink used in cleaning is recycled back into the cartridges. I've also only ever used official HP cartridges which are expensive but offer a consistent quality.
When printers are tested in reviews the cost per page is calculated by printing a page continuously until the ink runs out. Nobody prints like this, a better test should be created.