I think I have figured it out.
For every 1% critical chance = 25 physical damage. (Edited from 100 – error)
This is the calculation I used:
Assume character has 80% crit chance, meaning out of 10 shots, he will crit 8 times.
Assume 5000 base damage, so critical hits will deal 7500 damage (excluding critical attack stat multiplications).
On average a character with 80% crit chance will deal 8(7500)+(10000)/10 = 7000 damage.
On average a character with 90% crit chance will deal 9(7500)+(5000)/10 = 7250 damage.
Therefore, 10% crit chance gives us 250 damage. For every 1% critical chance = 25 damage.
Earlier, we have established that 6.66 critical rate = 1% critical chance. So 3 hair costumes with 10 critical rate each will provide about 4.5% critical chance (30/6.66 = 4.5).
So, 3 hair costumes with 10 critical rate (total 30 critical rate) will give us 112.5 damage (4.5% critical chance x 25 damage).
As you can see, 112.5 damage is really close to the average 120 damage we get from 3 hair costumes if they only gave phys damage. In addition to this, we can also put STR instead of DEX when we have critical rate in our gear making our critical attack AND phys damage higher.
This only works for high base damage, as in this example, 5000 damage was used but in the case of lets say 2000 damage, phys damage would win because at 2000 damage 1% critical chance only gives a mere 10 physical damage – as would be expected when the base damage is also cut into half.
TL:DR crit rate should be better on hair costumes at high base damage skills or auto attack (e.g. 5000 base damage) than phys damage. 5000 damage is actually very possible in rank 8 (i.e. end game).
I’ll broadhead you to death.
this was my main now my alt I just rush 190 and that’s pretty much it. 2-3 magic arrows and the boss is already dead xD