On average, you can expect a 16-month payback period for your CFT investment. This accounts for 20 weeks of startup time followed by your first 10-12 months of sales.
Larger systems have a shorter breakeven period.
Another factor is the price you can get for vermicompost in your market. Product from Michigan SoilWorks CFTs has the highest quality by biological assays and as a result can justify a premium price compared to other sources.
Also, if you are processing your own waste stream you can avoid waste disposal fees and further improve your return on investment.