Mechanical device with moving parts.

Price competition creates a race to the bottom.

Third party inks (in photography forums people are always cleaning up inksplosions when they try borderless printing with off-brand inks)

Paper handling is tricky, like in my old farmhouse humidity makes paper curl. A high end printer can handle this much better.

Cheap paper, mo’ problems.

Operator error. You see reviews on sites like bestbuy.com where somebody posts photos of an inksplosion caused by putting photo paper in the wrong side up. I print photos with documentation on the back and I learned through experience that you put the lightly inked side through first otherwise the ink makes the paper curl and you get more jams.