I can get close to 15-20 cards for the price of the ink cartridges and that's not even touching the price of buying software to print cards.
But it's very difficult to beat the cost of a laser printer, especially for infrequent prints.
Store-bought cards offer some things now that you can't (easily) get with a laser-printed "card", though, such as 3D shapes (such as pieces that unfold when you open the card) and music-playing modules.
The EcoTanks share a lot of capabilities of the SureColor lines, have some great design software, and can do real borderless printing. It's the ecosystem and compatibility that make it.
They make great backgrounds for collage and pair really well with things like linotype and block printing, which there are a lot of models for if you have a 3D printer.
Can you expand on this a little? Thanks.