Like others have said if you vape at the temp required you're not going to be left with anything that is unusable for cooking or extraction unless taste and potency are of no concern, you just end up concentrating that nasty smell and taste of a cashed vaporizer bowl. Plus that stuff counts as real weight if the law shows up and it could put you over a limit or into a worse charge depending on your situation.
The flip side of the coin is of course, that if you vape long and hard enough to get all the oil, you will have already cooked it past the point of optimum taste.
We prefer to vape off the tasty stuff and extract the rest for an oral or topical.
So far in Oregon, sanity has prevailed and we have no such draconian MMJ laws. Given the number of dis-eases that are treated with oral and topical medications, those laws in other medical states, would be the first thing I would suggest petitioning for change. Many of our most effective potions include ostensibly non active ingredients like coconut oil to slow down the liver, and intake through the lungs is ineffective for some types of diseases.