For one, imitation extract comes from the byproducts of the paper industry. And at one time, 60% of the world's imitation extract came from Ontario, where there is such a big pulp and paper industry. Also, vanillin is not found solely in the vanilla bean (which is from a type of orchid), it is a chemical compound that can be made artificially (ie; from wood) and can occur naturally in things like wine if they have been in certain types of wood under the right conditions (Yellow Tail Shiraz, anyone?)
Update- The homemade vanilla extract was DELISH