Yes it's very open to debate I agree as there hasn't been enough research but out of interest why do you say it doesn't work? Personal experience or do you have knowledge in the field?
My friend was on a drug trial for her cancer. Unfortunately she died and I saw her CBD medication.
It does contain THC one bottle has 20grams the other 50. She also had 4 bottles of "unofficial" supply that she used before the trial but didn't like because she felt it made her paranoid (it turned out it was progression of the cancer affecting her adrenal gland).
It all depends on the quality of the base ingredient and the maker. You can get very good home made oil. People in chronic pain will always find good oil. The problem is they don't care if it their totally wasted as long as the pain disappears.