I would agree, at least if higher quality items were actually difficult to get. Currently this doesn't really matter much, because it isn't hard to get the high quality stuff.
If, for example, you needed to actually put in work to make saplings grow at higher qualities, and crafting equipment/stations did not provide such massive bonuses as to negate the lower end material input (they should provide some, but it is currently a little balanced toward the high end.) I think your system would be great for inducing trade among nations and making people actually work for high quality goods... but that issue would need to be addressed to make them rarer. That may not be something that the dev team desires.