As crazy as it sounds, you may be able to sell it to a flavor company. A firm I worked for years ago used fusel oil as a starting material for a number of flavor ingredients.
In order to sell as something like starter fluid, you will probably need a very consistent product in terms of component profile, etc. Then there are all the regulations for creating, marketing, and shipping a flammable product. If you can sell it locally and privately you might be OK.