Yes I think this is one of the bigger problems of these systems. So for example, let's say you've created a device that only accepts rice husk and your device p

Yes I think this is one of the bigger problems of these systems. So for example, let's say you've created a device that only accepts rice husk and your device pays itself off in 10 years. Now suddenly your neighboring country is subsidizing the gasification of rice husk. This means that the prices of rice husk increase and you're expected ROI is suddenly changed. This makes investing in these types of devices difficult and unattractive.