Plenty of tech other than those two -- F5, McCaw, etc.

Sure, but based on what little I know about the Seattle tech scene, it seems like a common goal is to make a lot of money and then get out of the game entirely.

Contrast with Bay Area, where many people seem to love the game and aspire to be angel investors themselves one day.

This is just conjecture, there's likely some other reason.

Yeah, I get that from some Seattle people -- which seems really weird to me. If I didn't care about tech, I'd just do something like banking where returns are more predictable and to some extent easier. If I did care about tech (and do), I'd not want to leave just because I made a lot of money.