It's actually not that expensive to commute by air to SF. There are 261 working days in a year, and say $200 air fair per day, that's $55,200 in air fair. It'll cost more than that with to/from the airport, so say a hundred grand. This becomes doable at far less than $1m. I've made many day trips to SF from Seattle, and the plane was usually full of such day trippers.
Of course, if your employer is flexible, it can cost far less.
Better donate that $100k/year to scientology, or spend it in Las Vegas, it will have a more positive effect on your life than commuting to work by plane every day.
My comment was merely about the finances. One may also find such an arrangement more workable with working 2 days a week at home, or stay overnight frequently in SF.
Of course, if your employer is flexible, it can cost far less.