Not sure how to go about investing in something like this.
Well, you go find out how much it costs, get your calculator out to see if you think it will really do what these "salesmen" say it will do.
Or, just buy one and I will find a farmer to partner up with you. I will guarentee you will have a good tax deductionl, but remember, you have to show intent of profit to the IRS else it is just a hobby.
I also have a green, anti global warming, co2 coagulating bridge I could sell you.
One of the people with whom I often work made an 1800% ROI on a company producing solar panels. You can make a lot of green with green.
Actually they are Euros, so it is a more colorful pallette of bills. But, the 100 is still green.