You are trying to prove a point here, but the point you are trying to prove is flawed. So I will make a counter-arguement which will hopefully show you why it is flawed. With formula you used, we can apply it to other items like ello's band vs argas ring (so basically 3 agi vs 3 crit)
So here are the numbers:
23.43% crit and 933 ambush with argas ring
24.44% crit and 914 ambush with ellos band
So when we do that math:
(23.44/200) x (933) = 109.30095 for argas
(24.44/200) x (914) = 111.6908 for ellos
So from this demonstration you see that ello's band comes out higher than argas, so does this mean 1 crit > 1 agility? Because according to your math it does (which clearly isn't the case), so why aren't rogues goings around with crit enchants and crit gear? Clearly something is wrong
Please let's not mix up average damage with burst damage. Rogues are all about burst, and agility gives us that burst. If rogues wanted the highest possible DPS everyone would be rolling with haste because that has the highest average DPS.
P.S. I am not saying Saxx's gear isn't BiS, it could very well be that. All I am saying is agility vs crit is a much more complicated issue and we shouldn't just jump to conclusions when discussing 11 crit vs 3 agility from defias vs gloom.
EDIT: It is also important to note how devalued crit has become this expansion. The best way to show this would be with an example.
Pre-WoD 7 agility became 9.1 agility with the 30% agility boost passive rogues got, this would be 1.3 DPS increase. Pre-WoD 7 crit was 2.36% crit chance which would double your damage.
Now in WoD, 7 agility becomes 10.5 agility with the 50% AP boost rogues get, this would be 3.0 DPS. While crit chance stayed the same, 7 crit is still 2.36% crit but now it only does 50% more damage rather than double. So while agility now gives 2.3x more DPS than before, crit gives half the damage. So crit the agility ratio from pre-WoD to now is agility is 4.6x more valueable than before. Please correct me if I am wrong