I have recently modified my closed loop hydrocarbon extractor expanding the sample stacks and collector, so that I can use very poor sample quality and still hit the monetary sweet spot. The truth is that when you keep your solvent liquid by maintaining -60C and pushing it through the sample with nitrogen and cooling the sample to a similar temperature the yield is some very very good oil. So pure and good that at room temperature in just a few days crystals will start to form.
Whom ever tells you that you can't get good oil from poor sample just has no idea what they are talking about.