Why do people grind online multiplayer savegame games?

[SorenVC]

I told some gamer in real life I won't like playing Borderlands 4 when it comes because it is a savegame game, so you can play it for 1000 hours or more, then I'll join in with 1 hour playtime and have more money and weapons than your character. He looked at me like I'm strange. Am I not right here? What's the point of grinding a game like that, a game that is all about the grind (money, better weapons) when you can just get it for free? I don't get it.