Eastern Oregon is avidly sought. Most of the western part of the state, especially the Portland area, is less sought. Many new collectors are buying covers. Their interests are different than traditional postal history collectors. Newer collectors tend to focus on their home states, hence increasing interest in larger states.
Traditional collectors focus more on smaller states.
Oregon has traditional collecting roots, hence the demand is not increasing as much as California or New York for example. The level of interest in Oregon covers is in a tailspin.