lots of ink paying for more than you need
You pay less for an ink refil on an ink tank printer than you do a toner refil for a laser printer. This is despite the fact that the ink refil lasts longer.
I agree with the idea that infrequent users should consider laser printers. The main issue I have with them though is the cost. A colour laser printer is more expensive than even a tank printer which is expensive to begin with. It also can't do photos very well which is something a lot of people use printers for. Greyscale laser printers are only good for text.