I think many vendors take the medical value or their product seriously, but I haven't found any that really focus on it. In addition to just enjoying my high, I'm also looking for products and strains to treat a few specific medical conditions. I'd love to see a DNM vendor who has his product tested for THC/CBD/CBC levels and maybe also offers products such as tinctures. I'd pay a premium for this, for sure. Even more so, if they're willing to make custom tinctures.
Testing is prohibitively expensive especially for someone with the goal of staying anonymous.