The supplied headphones for the Fuze are essentially a promotional bonus, allowing you to enjoy the Fuze right out of the box. I wouldn’t be upset about them, as the de facto custom with audio players is to supply a “giveaway” set with the device.
Going back 25 years, the supplied headphone for the Sony Walkman was expected to be on par with the cassette player. Why? Because little headphones simply did not exist! Times have changed.
I don’t have the numbers handy, but an overwhelming majority of DAP users invest in specialty headphones. It’s become the norm to replace the supplied buds with something more palatable to the individual’s ears and tastes.
Looking at the local Target store, they have an entire shopping aisle stocked with nothing but headphones. The assorted audio players occupy a small ten foot length of an aisle.
SanDisk could supply a unique, high quality headphone, but they’d have to mark up the retail price of the final package. Nobody would be very happy with the inevitable result.