Running code on the Ethereum network is pretty expensive, so I imagine a private network would be much cheaper. Of course, just running your apps in a more cent

Running code on the Ethereum network is pretty expensive, so I imagine a private network would be much cheaper. Of course, just running your apps in a more centralized fashion is significantly cheaper. There may be some edge cases where you don't need the same levels of trust as the main Ethereum network but also don't have complete trust over the participants. I've always been a big fan of the technology behind cryptocurrencies, but have also always struggled with the use case for private blockchains.