I remember spending a lot of time in arcades when I was younger, I would watch the older lads playing the games. Most were just killing time but a few were very skillful. The time wasters would either be very rough with the machines or careless, shoving coins in the slot then cursing or simply walking away. The few, who knew what they were doing, would take their time and learn to play the game. They would be rewarded with an opportunity to input their initials if they scored highly enough and everyone, irrespective of skill or money spent, would see their legacy on the screen.
There's something very human about wanting to leave your mark, however insignificant, and passing on knowledge to others. It's an attempt to live on, in memories and writing. Others will benefit, but it's really about not being forgotten, the ego's refusal to acknowledge it's inevitable end.
"Remove prostitutes from human affairs, and you will unsettle everything because of lusts..."
St Augustine