Exactly what Kontossis said. This post is actually about items in general for AD carries and he clearly states that Doran's Blades + Vamp is just a noob trap. Period. Not for damage purpose only; in general. He's just bad. And you are the one that misunderstood his post.
And you basically said 2 things that make no sense. In the post, that guy says that getting a crit chance glove will give you literally Zero extra damage. I pointed that out and said it was stupid, and basically you repeated what I said without knowing it I think (or did I misinterpret what you said?).
Aaaand. You basically say I should respect his post because he compares the cost effectiveness for damage...... then right after that you say cost effectiveness is meaningless. k.
And no, getting Doran's + Vamp is not something you do only when you're losing a lane. It makes you much more powerful in lane in general no matter who you are.
I wish this site could allow us to show the users' elo sometimes...