Attack speed should be treated like a game changing stat.

The cost for attack speed is way too cheap imo. I say this because the people that are the biggest problem right now all go attack speed, Look at yi for example, he gets a free attack speed steroid and true dmg to back it up. Shyv gets to use her q more but shes basically a magic dmg fighter. Devour gives 50% attack speed at 2250 gold price, with runes and masteries thats another 20% ish? maybe around there. 15 from runes,5 from master or 4 which ever. Thats 70% attack speed right there alone. For vayne players they rune attack speed, 15% from runes. plus another 5 from masteries. THey get 40% from bork plus 25 attack damage AND life steal for 3200. That's 60% attack speed just off one item +runes/masteries. That is huge. I honestly think either tone down attackspeed, or increase the cost.