A) eastern Oregon all combined has about the GDP of Portland. If it were it's own state, it'd be among the poorest and require tens of billions of federal funds to operate at all. If it joined Idaho, Idaho would actually become less productive per capita while the remaining Oregon becomes more productive.
B) if independent it would give two solid red senate seats
C) most of its water comes from the Cascades, which would absolutely vote to remain in western Oregon, meaning they'd forever be dependent on a blue state, and would be taking advantage of blue states investment into water management while contributing nothing.
D) this move, if allowed at the federal level, would encourage other balkanization of states, creating mass confusion among businesses, generating billions in new costs to handle the bureaucratic strain, and generally make doing anything positive with taxes impossible for decades. That's without dealing with the massive number of lawsuits, e.g. decades long contracts with states that Might be invalidated with the new state that needs to be settled.
If your only reason to seek education is to make money, you 100% deserve to fail and suffer.