Again, what number are you looking at to call California wealthy? California state budget revenues are $4,366 per capita, which is fairly low-end. North Dakota, Wyoming, Washington, Kentucky, Minnesota and Oregon are all in solid five digits a head. California's is richer than Georgia's $2,320 per capita for sure, but if it were a person in a company of 49 other friends, it would be a low-income friend always trying to borrow money.
A GDP of $2.6 trillion, highest in the US and 14% of the US total. Deliberate starvation of state and city budgets doesn't stop California from being the richest state.