At the link - granted from week 4 - here was how the Chargers vs the Raiders, who have a big LA following - rated:
5
CBS NFL Single
KCBS (CBS)
U
11.0
472,667
So yes, advertisers were more than happy with 700,000+ viewers on a SATURDAY for the "home" team already eliminated from the playoffs. To be generous, if KNBC promised 500k viewers, they got 200k for free. The 11 is a household rating, not a share. Does it seem bad compared to Buffalo? Sure, but Buffalo is the #1 NFL market, and in general they watch a ton more TV than the rest of the US.