> You've created a logical justification for a myopic, misanthropic world view.

Nobody said it wouldn't be nice, but that it does not confer "obligation". This is the key word. I would argue a world where people do things because they want to, and not because they feel they have to, would actually generally be a nicer world to live in.

> Many find reciprocation important in a relationship.

Yes, and those sorts of relationships aren't really built on much if a gift obligates the other to repay. Why even buy lunch then? It just becomes this back and forth obligation and it is wearing and actually erodes the relationship slightly, if anything. I would argue a true gift is one that does not obligate the other party to reciprocate. That does NOT mean it would not be a decent thing to do something nice (for the other person OR someone else), but just that it is not obligated. The person should not feel a weight to do so. Once this weight is lifted, it is actually very freeing, and it strengthens the relationship, if anything.