People will tell you various things until they have seen it themselves, that is fine. Everyone has their own opinion, I myself have a huge "YES" under the right conditions. Tie-cords or tethers as some call them have been used by gamefowl owners for a LONG time. We usually hatch so many, and the birds are so aggressive they cannot be thrown in 1000+ dollar coops or large runs or the fowl will kill each other. So we go the cheaper, convenient route.. I encourage people who wish to try this to put only cocks on them, hens are too busy-bodied usually to be on them without going crazy. Or has been my experience..
If you do it, make sure the bird has good shelter like the 55 gal drums you get free a lot off craigslist, cut a hole in the bottom big enough for the cock to crawl into when weather gets rough.. Tee-pees work too, and are easily made, but do not offer as much wind protection. It's also best to have them in a fenced in yard, with if you can a good dog running with them like a great pyrenees.. Also switch the cord on the birds leg once every few weeks at least or it can sometimes make them spraddle legged. Or you could just use them as a daytime area, some people who own gamefowl use them during the day for "Free ranging" but where the cocks cannot get to each other, then put them up in pens at night.
-Daniel.
ETA: And I just wanted to add, just because a cock is tied out does not mean he is a fighter. Just because they are a game doesn't mean they are being used for cockfighting, just because the man owns various cocks DOES NOT MEAN HE IS A COCKFIGHTER.. Those are some of the most ignorant, stereotypical comments that arise often on threads involving games. I don't mean to sound harsh, but it happens far too often on this forum because people never look fully into a subject.