The printer industry has a vested interest in your purchase of a new printer every couple of years. A high level employee once told me that the only way to force this purchase is to up the cost of the ink on the older units to a point that it is cheaper to buy a new printer than to continue to invest in ink.
Most people know this now, and there is a booming market for alternatives (Amazon has a lot of generic alternative inks). I recently went to purchase ink for my 2 year old printer only to see the bill was going to be $100 for 4 cartridges. I went on Amazon and got 10 cartridges for $25.
Today I put them into my Epson printer and I swear the thing took it personally.
I immediately got "We see this isn't genuine Epson ink. Are you SURE you want to use this ink? It could cause [death / disaster / world catastrophes]." I clicked yes, and the printer still wouldn't budge until I pressed another YES button on the printer itself. Finally out of protestations, it reluctantly printed out what I'd asked for.
In perfect color.