I wouldn't say it's that unusual in SF after sticking with a good company for a while, but I think I'm perhaps a few years ahead of where others would be at my age. I work on game engine / platform development for iOS + Android. I'm obliged not to share who, but it's a semi-mature startup.
From what I've seen, the market for good game engineers is a little harder to get into - fewer jobs, perhaps, than going into web or app startups, but the difference between someone who knows what they're doing with games, and someone that's not (in my experience), is more noticeable. It helps that, in the mobile gaming space, the revenues (and hence, the rewards of talented early-employees) from a financially successful game can be obscene, if you can do it right (keep UA + retention costs down).
From what I've seen, the market for good game engineers is a little harder to get into - fewer jobs, perhaps, than going into web or app startups, but the difference between someone who knows what they're doing with games, and someone that's not (in my experience), is more noticeable. It helps that, in the mobile gaming space, the revenues (and hence, the rewards of talented early-employees) from a financially successful game can be obscene, if you can do it right (keep UA + retention costs down).