For people that keep them with beef cows, in well-fertilized pastures, and vet them, feed them, supplement them, etc, like they do their beef cows, it would cost nearly the same as it does to winter beef cows. Their only edge would be the initial purchase price of the LHs. And using Char bulls, they probably do bring half of what a polled, black beef calf does.
Never seen Corriente heifers used at a rodeo or roping, just steers. Probably because til about 1980 or so, steers were the only things you could import out of Mexico. There are three rodeo production companies with in 35 miles of me, and they only use steers. In 50 years of rodeo, I have never roped a heifer, or seen one in the pens at the rodeo grounds. But, even if they used heifers in rodeo, it wouldn't hurt them to be "used up" as far as breeding. An animal ..bull, bronc or steer, can only be used once in a rodeo, so they come out of a chute, run down the arena, and are roped or bull dogged one time a week during rodeo season.