What are you talking about? The Bay Area has one of the greatest weather of the world, lot of job opportunities, beaches near by as as mountain. Lot to like also.
"No" reason is probably an overstatement. But it's certainly a different lifestyle than e.g. living in a suburban / rural area and working remotely. Many of us would consider it a step backwards unless the net increase in income was life-changing.
That's about how I figure it. Even if you try to split the difference by living in the suburbs of NYC, my impression is that housing is still pretty expensive and you have a time-consuming commute.
I only spent couple days in NYC, but the experience was pretty awful: the city is crowded, it stinks, and is full of weirdos (for example some random girl I asked for directions turned out to be a prostitute, some guy started to yell at me for no reason, etc.). I also almost got killed by an SUV when trying to cross the street, and my hotel room turned out to be the size of an average walk-in closet.