I was a stark, raving, Warriors fan from the first time I saw them living in the Bay Area before becoming a stark, raving, mad Kings fan in 1985. So basically I was a W's fan for 15 years previously and a Kings fan now for 23 years.
What I noticed was that the REAL torn fans (like me a bit early on) are not in Sacramento or Oakland or next to those cities, but in places like Fairfield, Vacaville, Tracy, Antioch and a couple others. Around those parts they're almost half way or actually are half way between Arco Arena and Oracle Arena and Bay Area and Sacramento media markets overlap - meaning both teams appear on their local cable affiliates.
The rivalry can be rather pitched in sports bars in those places when the two teams match up but because both have been doormats of late or one dominate when other one was not - a truely sizzling rivalry has not taken off like it well could.