The only people I have seen do it are horse traders who keep halters on all the time. And when I see people do it... it drives me crazy... I don't know why. It just does. I always have split reins and I can just throw it over a branch or fence or whatever and my horses will stand there all day.... so no need to tie them when trailer riding.
Many people have sighed for the 'good old days' and regretted the 'passing of the horse,' but today, when only those who like horses own them, it is a far better time for horses. ~C.W. Anderson