I'm very interested in making my own formulation. Still just getting into it. Much to learn. I've always thought the market is a gimic.
As a med grower I think it is imperative that you understand exactly what is being fed to your plants. Nutrient formulation isn't so hard - check out hydro buddy software and begin learning some formulation theory.
There's a couple of good threads on IC Mag I've seen on formulation. Perhaps Storm Shadow can advise you further on this one. Basically the hydro industry isn't dissimilar to other industries and I've perhaps been too hard on them. My prob with the industry is that actives aren't listed and growers are fed shite by just a few companies. Med has changed the game plan - you cannot grow a medical crop and call it med without a good set of ethics. I think in the coming years the industry will change as new players arrive and bring with them professional standards. That will help to clean up the cowboys.