I know this is a little off-topic but is still related to your product -

what's the alcohol% of the final product?

I agree with you - doesn't make sense why one can buy flavor extraction @ your local supermarket without even showing ID, heck one can buy over-the-counter medicine with a pretty high alcohol% without ID - so why can't one have a cannabis tincture that's only being sold to patients? Of course the current cannabis laws don't make a lot of sense anyway.

I've never heard any good explanation on why it's frowned upon or if it's even really frowned upon. Supposedly the ATF will make a stink about it, but not sure. Maybe try to contact someone who's in the non-cannabis herbal extraction/tincture biz. See what they have to go through. There's a couple of herbalist in Boulder who are also mmj-friendly.

Good Luck!
I make my own tincture, with alcohol too, as I found all the tinctures sold around town to be lacking in potency. My last batch I used a mixture of alcohol, coconut oil and glycerin - WOW packed a punch! Best yet! With a typical size 1oz dropper bottle - only takes about a dropperful.