Vayne was not intended to be user of 
that bursts down others in 3 autos.
Vayne was intended to be a user of 
that excels against tanks.
Taking away the crit&AD synergy on Q would discourage vayne to actually build anti-tank instead. Of course it would put vayne in weaker spot but if it's a problem, i think adjusting number would do fine.
Vayne has always built crit even if she didn't rush it.
The fact that she now rushes crit goes to show that crit items are too undercosted... which is something many people have been saying for months now.
Vayne is absolutely an intended crit user. You're making outrageous claims because you don't like her.
nasus Q wasnt meant to be used with trinity too... but he does.
anyway, proof?
The price point of critical items is fine, it's the power given by critical strike that's a problem.
The price point is fine because ADCs are more item-dependent than any other class. Making their core items more expensive just punishes whichever ADC loses lane in a game, since ADCs can't side-grade into alternative items to survive being put behind and because the pieces of their build are fairly bad on their own (even Shiv doesn't do too much on its own unless you luck out on getting a proc to critically strike).
