Construction and services are not intangible. They have the exclusive rights for the Indoor fishery systems in China.
If they were to sell or franchise the technology, and build the farm for a third party, would that not be "tangible" revenue, same as any service or building company?
Then you are clearly missing the point. Not unlike the rest of the market btw. It's very tangible, and they are not "shuffling" money between themselves and JV partners.
SIAF is a consultancy and services company. They have the technology and know-how to build farms that are much more profitable than the local farmers. People are willing to pay for their expertise.
Then, when the farm has been built, SIAF has an option to PURCHASE a 75% stake AT COST. If the farms are so damn profitable, why wouldn't they? After all, they have the expertise to run the bloody thing.