It's not that Oakland is that good, it's that the Seahawks are probably the worst road team in the NFL. They've lost 15 of their last 19, and after today it will be 16 of 20.
I don't know much about the NFL, but I bet against the Seahawks every time they play on the road. Doesn't matter what the situation is. They got me on the Chicago game, but that's my only loss this year going against them on the road. Fading them on the road is a cash cow...