I drive from Mercer Island to Spokane every weekend, and I commute from Puyallup to Mercer Island every day for work.
Going to work I'll see anywhere from two to five WSP, but usually traffic isn't moving fast enough for them to ticket. (Although, most mornings they have one or two people pulled over in the bend just in I-5, just a couple minutes north of the Tacoma Dome.)
Driving across the state I've only been pulled over once (near Ritzville). I won't say how fast I was going, but it was fast enough that right when I saw the headlights on her patrol car I immediately pulled over and waited for her to give me a ticket. (Which she did, and she knocked it down to something a bit more reasonable, money wise.)
Now when I drive across the state I just throw my cruise control on at ~83 MPH (the extra three because it helps me get ahead of those cars whose speed "drifts" from 75-85 and back again, which is very annoying). Usually I'll drive past two or three officers who just sit there and watch me fly by at thirteen over.
IMHO the worst are the county sheriffs near the Chelan area. Those guys will ticket you for 51 in a 50.
Unrelated: are you from Poulsbo?
Eastern WA is just so much less populated.. maybe they stand out more, but they're not as common IMO. Granted, your speed will be higher when you DO get busted, and there are definite speed trap downs like Ritzville and Colfax, but I never found it to be anywhere near as bad as the metro areas.
And yeah, they can just fire all those assholes. They're absolutely terrible and do nothing to promote road safety -- it's the exact opposite.
Targeted or not, they like to do insanely stupid things like park their cruisers on the shoulder of a bridge, inches from the lane of travel, lights off, at night, trying to "ambush" people.