Do you Really think the Average (or even Above Average) Person is going to do a NET using Hexane? Or for that Matter, any Extraction Method?
Will they or can they?
And like I said, you can use distilled water. Anyone can get that. It's just slower and not as efficient. You'll get less pure nicotine from the same amount of tobacco using it, but it works.
The real question is how many people will start growing their own tobacco? I suppose you could go buy a big pack of roll-your-own and extract from it, but I suspect that wouldn't be much in the way of savings compared to buying ejuice.