User blog comment:StrategicMagic/Vayne - Carry? Yes. AD? No./@comment-5419795-20120819031405

Here's the problem: Building an AS heavy AD build gives you almost as much attack speed, and about 5 times as much DPS. Going IE, 2x PD, BT, LW and Zerk's gives you 1.9 AS, 455 MS, 340 or so AD, and 85% crit chance. You will proc your E every 1.56 seconds or so, and almost always get 2 crits for around 800 damage. The minimum damage you could do in this time is 1000 plus the 8% HP true damage. This is much, much higher than what you would get out of a pure AS/on-hit build. There's a reason AD Vayne has (if I remember correctly) the highest DPS in the game.