The market for hagfish is almost entirely Korea. Hagfish are barbecued fresh, and also eaten in stir-fry dishes. Pacific hagfish are shipped alive, and fetch a better price than black hagfish, which don't ship well alive and so are frozen.
The skin is marketed as eelskin, and one hagfish yields a nice rectangle of skin. The rectangles are sewn together into squares, and sold as leather or in products.
Industrial and medical applications for the slime are being explored - making fabric from the slime fibers, using the slime to treat burns, or use dry slime to make bandages that are wetted after they are applied.