>What is the societal benefit provided by it?
Same as beer or any other drug - just a way to have some fun and not destructive provided you can control yourself.
Though, the one time I opened a CSGO gun case and felt the dopamine rush, it was way stronger than any drug I've done. Not that I'm a "highly-experienced individual", but alcohol, weed or adderall don't come close to a CSGO case. Gambling feels much riskier.