how come KFC don't sell beef?

They don't sell beef because their theme is chicken. Thus the name, Kentucky fried CHICKEN.

I'd assume it's because the name is Kentucky Fried Chicken, and Popeyes is Popeyes Chicken.

Because they don't want to.

Probably b/c their chicken sells so much better. If no one buys the beef items much, maybe they'd actually lose money? Not sure.

Since KFC aim at selling chicken...like they said, chicken all the way!

Many years ago they tried selling beef with restaurants called Kentucky Roast Beef, at the same time they tried some fried fish restaurants. These didn't work out and they ended up going back to just chicken.

Because McDonald's and Burger King are fast FOOD restaurants. KFC and Popeyes are a chicken place.

They don't want to

McDonalds can sell grilled and fried chicken sandwiches because they already have grills and frying vats in their restaurants. KFC doesn't have grills, and it would be very expensive for them to install them.

beef doesn't taste too good fried in motor oil