But anyway, I guess society is real, that is, "a sum greater than it's parts". By sticking to the rules, you signal conformity with society. If you don't follow the rules, but still dine at the table, you might just be a parasite of society.

That's probably not the real reason, but that doesn't prove that there is no reason. Frankly I am surprised that nerds would give up on questions like that - I thought they LIKE puzzles?

Things like that are often being studied in economics, I think. Personally I think it is pretty fascinating. (Forks are maybe an especially stupid example, for example dating and gender roles are more relevant).