It is interesting. I think it was more common back then, because after your MLB years, the more independent minors, like the International League, the Pacific Coast or Texas League could use you, and you didn't make $10 million a year playing so you didn't need the money. You needed to make a living, so why not play in Cedar Rapids, Omaha, Minneapolis before there was an MLB franchise there, etc.?
So people could see former big leaguers in their home towns when they went to the ballpark more often. Another America.