I think you flagged what has become a true pricing trend. Across the board on almost all tickets (other than unrestricted coach) OAK is more expensive than SFO. When you combine that with several other developments, OAK is now the less pleasant option all other things being equal:

-- SFO has direct-to-terminal BART service (OAK has the airport bus connection which is slow and not as reliable),

-- OAK has free WIFI, but SFO is getting that soon too

-- MPO is that OAK has fewer restricted RR seats available too (and probably higher loads than SFO)

I do like the parking options (and prices) better at OAK but even that is getting closer as SFO lots are offering more coupons it seems.

OAK: Please come back as THE low cost, convenient Bay Area option. We miss you!