I have neighbors who sell most of their bull calves for breeding. They don't charge an excessive amount, have decent stock, and everyone around here right now wants Red Angus, and they were in a few years before the craze hit. I bought one a few years back, had some nice calves with him. It's no more work other than keeping the weaned heifers away from the weaned bulls the way they do it. Getting from $1750 a couple years ago to probably $2000 now is a nice little income boost.
I will quantify this by saying that people around here are small time and wouldn't spend the extra money for a big name registered bull. The neighbors could cut more than they do, but people still take them. More power to them I guess, no one is twisting the buyers' arm.