Given that waitstaff in California make significantly more minimum wage than in other parts of the US, why do we tip the same 15-20%?

I'd like to see restaurants pay their workers a fair wage, adjust their menu prices or impose a mandatory service charge accordingly, and ask their patrons not to tip unless it's to recognize exceptional service.

Interesting commentary on this place, that has a mandatory service charge:

http://www.yelp.com/biz/iberia-restaurant-menlo-park