I figure most of my culls as at least as good as some of the hatchery chicks out there, and I sell them as pet quality, I guess I could sell them as "red roosters" lol. With 20 girls I would probably keep at least 3 roos if you have the space, it's always nice in case something happens to one, and also you could keep different lines available. Swap out roos , wait a month and hatch and compare the chicks as they grow up. Some times two lines are compatible and sometimes two nice looking chickens will have some real loosers. If you are showing, and have the space, its nice to keep several extras if they are show quality simply because you never know when one will molt or break a toe or something, and you would still have something to show.