Maybe it's not a scam? How weird's that? Well, maybe I'm being overly optimistic... On the other hand, composting sounds like one heck of a more reasonable business model than Cyclone or the WHE. For one thing, composting is a real thing. For another, people pay money for black dirt. Beyond that, people pay money to have sticks, leaves, garden waste and the like hauled away. I used to live in a town that taxed you for fall leave pickup and then sold the resulting compost for a profit. There's something to be said about a business where people pay you to take the raw materials off their hands and then pay you again for the finished product --- a product that needs very little in the way of capital or expense to process. I can see, theoretically at least, how you could make money on something like this. The big thing would be getting all the right contacts for collection and marketing.
Maybe it is a scam but it sounds a lot more plausible than the previous ventures.