Why is Crit Random?

I see no reason why crit is random. How it could be: "Every 1% crit increase your auto-attack damage by 1%." It would be the same at the current version, without the randomness. Math: You have 200 AD and 50% crit. You aa 10 times. Average outcome of the old system: 5 aa crit for 200% dmg, 5 aa dont crit for 100% dmg. 400*5 + 200*5 = 3000 Always the outcome of my system: All 10 aa do 150% dmg. 300*10 = 3000 What do you guys think?
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