Now, what would a non-technical user even benefit from Little Snitch?

Also, what are you trying to protect against using Little Snitch in this way? Are you a paranoid group of journalist dissidents who are suspecting targeted spyware, or are you just frustrated that installed apps "call home" to check for updates and whatnot?

Perhaps you should better invest in setting up a traditional firewall on the lan for central configuration. Then you also have the option for other IDS systems, such as https://www.snort.org/