I bet a very high percent of that is because of the insane prices people are paying there for gas. Give them the $3.19/gallon we pay here for gas and my bet is that number drops drastically. I also bet the insane price for gas in CA is a reason why people are leaving the state, I'll refrain from stating the other reasons. Here's something to ponder, choke a person long enough and they'll submit. The same can be said for the price of gas and EV ownership in CA, I bet a lot of people submitted.
There is no doubt this is true. It is a key reason I started driving the Model 3 more; I was not really that interested early on. But my interest peaked as I experienced the benefits of ownership, not to mention just how much fun the Model 3 is.
Gas is expensive here; housing is worse. There is also a lot of money and opportunity around here; we are a huge economy that the entire country benefits from.
You did well leaving thinly veiled political hit jobs out of your response. Kudos for that.
Here are additional reasons Californians buy a lot of pure EVs and hybrids, beyond the obvious gas cost savings:
Car pool lane use (something I was strongly against)
Environmentally conscious
Early adopters
Tax incentives (anything to offset some of my tax bracket!)
Lower maintenance vs ICE, especially vs expensive ICE
Lotsa techophiles; we like tech!
Very high per capital income (Lotta beautiful high-end German cars around here)
Torque, torque and more torque (aka fast)
Easy "fueling" at home vs gas stations
And reviving the failed Fremont plant; hiring tens of thousands of workers (this was key for me)
People may agree or disagree with these reasons, or flat out not believe them. But these are reasons cited by customers.
A more current reason is repeat buys due to satisfaction.