Davis tickets on ebay seem to be going down in price. I bet the two shows in Berkeley are drying up the demand. I wonder if the Pixies are announcing with that in mind. Probably not but it's pleasant to think that some of the scalpers are losing some of their profits.
All the shows I've ever seen there have been general admission. I don't really see how you can make it otherwise. It's an open standing area on the ground with concrete "steps" running up the outside for seating.