It has been a long time since I operated into WA CTAFs but I don't recall there being bankrunners, private GA ops, and training flights operating into the same airspace. Mostly the WA CTAFs that have RPT traffic are to service mining operations so the traffic in the CTAF is more likely to respond to your calls. It's not a coincidence that the density of traffic, the near misses and mid-air collisions are on the South-Eastern side of the country. Possibly east coast pilots just don't come up to the superior standard of west coast pilots but I think it reflects the limitations of see and avoid and self separation with a mix of RPT jets and GA operations.