The featherless chicken is a recently modified organism. To create this organism, scientists took a gene from a "naked neck" chicken and injected it into a normal feathered chicken. This gave regular chicken less hair and over time, the became completely featherless.
The benefits of this disturbing chicken is that it uses extra energy that is usually used to grow feathers, but instead they use it to grow meat. Since they grow more meat, they can sell more chicken and make more money. Finally, people don't have to pluck feathers any longer.