https://www.youtube.com/watch?v=wvEwubAId_g
While Seattle doesn't quite get as much rain as Vancouver, BC, you still have to endure half a year of cold, damp & dreary weather. At least there usually isn't that much snow to shovel in the middle of winter.
Perhaps some people are getting fed up with 100F summers in other places.
While L.A. can easily have some 100F summer days, that's hardly the case in S.F. Indeed, SF doesn't get as hot as LA in the summer or as cold as Seattle in the winter. Honolulu just might have the best overall weather, not quite as hot during the summers in Miami and LA.