This is coming from someone who never played AD&D but did play a lot with people who did play a lot of AD&D; the purpose of it felt like you were supposed to "solve" the game. The point of the game was to gain as much treasure with as little personal danger, which lead to a sort of arms race of one-ups-manship. RPGs are really a weird pasttime where you're sort of playing against one of your friends but really if everything goes well everyone wins. There's no sport where both sides can win even though they played against each other, no board game or card game where one side is the opposition but everyone comes away feeling like they won. RPGs are a pretty unique niche in that regards and that sort of bond is not explicit in this text when it really should be.