What are the drawbacks when using a hammer?

I am doing research on a new product for handymen and construction workers. I want to know when your hammering a nail do you ever get frustrated with all those nails? Have you ever dropped the nails on the floor? Do you wish you had a better way to carry your nails instead of those boxes or cases? How does the idea of a nail dispenser sound to you? Would you want a portable nail dispenser that could be attached to your tool belt that is retractable as well? How does this sound, a portable automatic nail dispenser with a retractable cord attached to your belt designed to make the process of hammering a nail a bit more faster? Would you throw away your case, box, etc if it was able to carry over a hundred nails even different kind of nails?