Hiring juniors in LA has been delightful; so many strong candidates, no real competing offers. That being said, it's also pretty easy to poach burnt out, fed up experienced juniors from the Bay Area.
Poach said junior devs from the Bay Area to LA or in general? Sort of confused with your second statement. The crazy thing is that every one of my CS major friends I graduated with at USC moved up the coast to the Bay Area or Seattle, or to the east coast in NYC.
Bay Area to LA but in general too; many grads leave the LA area, so it's not a hard sell to get them to come back after they pick up some experience. Bay Area just happens to be the biggest consumer of fresh graduates.