In my experience the budget frames are composed of the parts that get culled during production of clear or commercial frames. I haven't ever measured moisture content in them, but suspect they are the same as the commercial frames . They usually have a knot in a location that will either cause frame failure or makes the frame look ugly or they have a twist in the top or bottom bar because the section it was milled from was not quarter sawn.

They are perfectly fine frames if you are like me and don't care if they have a knot hole in them somewhere. I cull out all the parts that have bad knots where two parts of the frame join together...