It was all the rage, as I remember, in the 80s. Sometimes the starter was called Herman. I haven't had it since but I had a very healthy sourdough going and several days ago I decided to turn some of it into a sweet starter. I made the AFC for my neighbor and a small loaf of it for my family. Everyone raved about it so I just got a second sweet starter going to make a chocolate one with cherries and pecans.
At least I was considerate enough to only make enough starter for the cakes so that I'm not saddling anyone with the demands of the starter. ;> But maybe it's time for this to be revived.