Ink cartridges is only a $1B global industry [0]. That isn’t a small market, but the global printing industry, with all digital content being transferred onto any 2d mediums through automatic means is probably closer to $1T. Think about every book, every magazine, every coffee mug with a funny saying, every graphic TShirt. In the world.
The ink cartridges are good money, but it’s not where the money is at.
[0] https://www.rfdtv.com/story/42630937/global-ink-cartridges-m...