I think right now is probably a little premature for a sale. But if you look at how big hydroponics and growing supplies are today, it seems you'd have a good chance at selling it in the future in the mid $x,xxx range.
I don't know much about the industry, but it looks like Extractors range in price from $500 - $250,000+. If they can get a reliable "CBD extractor" as a product for small businesses in this industry I can see the domain selling for more if the right company comes along.