If you refrigerate your starter you only have to feed it once a week plus it can take a lot more neglect than if you keep it out. Not that you should neglect it. I feed mine on Saturday night so I can use the discard to make a sponge for Sunday morning sourdough blueberry pancakes. YUM!
Speaking of SF - did you know it has it's own specific yeast?
Lactobacillus sanfranciscensis
Why Is San Francisco's Sourdough Special?
Almost every food lover associates sourdough with San Francisco, but why is that? Surprisingly, it's because sourdough really does taste better in San Francisco! Here's scientist and food specialist Robert Wolke explaining it to NPR:
"The sour flavors come from lactic and acetic acids produced by inevitable environmental bacteria, which are working on the flour's sugars along with the yeast. Different bacteria make different sour flavors; San Francisco is awash in local bacteria species that make its sourdough bread famous. So sourness per se in some ryes and many other breads is quite desirable."
And there you have it: San Francisco's sourdough bread is good because San Francisco's bacteria is particularly tasty. Some may find that a touch gross, but I think it's incredibly awesome.