Ok now I'm a bit pissed because for the 4th promo in a row I've had an afk. EVERY promotion I have it happens , and I don't understand how a Silver 1 Miss fortune can build ZEAL before buying any damage items then just leave after feeding bot lane. Wouldve won too because I had tons of kills mid but she afkd.
Don't build attack speed on adcs first. DON'T. DO. IT. And playing vayne does not mean you HAVE to build noting but attack speed! Think about why you're buying the items for crying outloud and if you're incredibly far behind maybe you should just get bloodthirster vayne instead of rushing 2 attack speed items.
Bloodthirster vayne when you're behind and you'll proc silver bolts like twice per teamfight.
I can tell you that's defintely not true because I've seen it first hand. My main duo is an adc player in gold 2 and we've won dozens of games with vayne rushing bloodthirster every single time. It gives great mid game burst and when you're behind you're generally not going to be able to stay in a fight very long anyway. With BT just tumble -> 3 shots on a target does good damage and if you have to run away because you are behind it works very well. Also people act like attack speed is godsend on vayne and you need nothing else, this is not true and I'd wager that AD is very valuable early game for her. Rushing attack speed is just ONE way to build her, it has its pros and cons and needs to be thought about.