when I say "extra roos" I mean roosters that you hatched or have that you can not keep.
I'm surprised that the results of your poll show that nearly 70% eat them. According to a poll Nifty did a while back, less than 10% of the forum members raise chickens for meat. But you are right, if you hatch chicks, you need a plan to get rid of the excess. It may not only be roosters. The number of pullets can add up pretty quickly too.
I raise mine to eat and I only hatch what I can eat, roosters and pullets. So I control my hatching. If you have breeding program going, you have to hatch a lot of chicks, so that becomes harder. You can only eat so much chicken and it becomes expensive to feed them to butcher size or to an age where you can clearly determine sex. And some people just have a hatching addiction, where they just hatch. A lot of people don't eat their chickens. That's their choice.
Some people kill and dispose of excess chickens. Some may compost the bodies, just bury them, feed them to other animals, or, if they own the land or have permission, dump the bodies in the wilderness so wild animals can eat them. I'm sure there are other options to dispose of the carcasses.
Some people sell them or give them away. Craigslist or a note on the feed store bulletin board are possible ways, but there are others. Some people have a regular buyer. Once you sell them, you lose control of them. Most will probably be eaten, but at least someone will get a use out of them.
Some of the more exotic uses for excess chickens is to provide them to a zoo so they can feed their meat-eating animals or maybe provide chicks to a friend that has a pet snake. Maybe provide carcasses to someone that is making organic compost.
You are right. Half the chicks that hatch will be roosters and you have to have a plan.