Biv I have honestly not done a cost analysis. I do it as a hobby, for fun. I started out doing it to see if I could do it, and nobody was more surprised than me when they turned out good.
Keep in mind though, that even my extractions have 36mg unflavored nicquid (not Nicaragua, as my stupid autocorrect wants to change it to LOL) added in amounts ranging from 33-50% The tobacco concentrates probably have about 2-5mgs nic by themselves, but they would kill your atty in a second if you tried to vape them straight.
Scarfy, how much nic is in the Montecristo? Any idea?