Follow the money. Apitherapy, just like many natural/herbal remedies, does not hold the promise of patented, designer-drugs that produce big-money results. And, regarding bee stings specifically, it would be difficult to do a proper, double-blind study of their effectiveness, since that would require development of bees that could sting with a placebo venom instead of regular venom!
Why is it that even though some promising research has been done on honeybee products, that there still does not seem to be anybody who cares too much for it in the scientific/medical community? Is it just me, or do you all feel that there should be more serious research and implementation of the results that are found through such research?