Same reason why people use walkie talkies. You get to do voice or data without infrastructure. That's kinda cool. Also, listening to ATC, satellite telemetry,

Same reason why people use walkie talkies. You get to do voice or data without infrastructure. That's kinda cool. Also, listening to ATC, satellite telemetry, and other sorts of radio communications can be fun too. It's like having some insight into… a lower level of the world.