A lot of people don't want to deal with cattle that are wild or have bad dispositions, so that's a big bonus for trying to breed good disposition into your herd.
You have to really watch the type of audience a sale is attracting. Some sales cater more toward purebred breeders, which are going to pay more than commercial buyers.
Are you selling calves at weaning to go to a feedlot, are you trying to accomplish a lot of carcass quality in your genetics, are you looking to produce replacement heifers or are you selling bulls?
What product do you want to produce - product meaning calves.