alt Hacker NewsNumbeo shows averages, and the basket of goods that it considers is not what a well-off person would buy. I Zurich I could live perfectly well without having a car, just with public transportation, and French and Italian cheeses and wine are a cheaper than in Seattle.
As a well off person your most significant purchase is going to be a house, and in Seattle they are 3x cheaper.
I just left Seattle Greater Area and my 350sqm admittedly old house + a small ADU with an outdoor pool went for $2M (at the moment it was a downturn, so maybe $2.5M tops now). What can you get for that money in Greater Zurich Area? A 100sqm flat?