Originally Posted by Bonecaller
I believe it has to do with the design of WoW. You dont get all of your ATP out of strength. Also the numbers dont seem to be absolute. They have to be seen as relative numbers.
E,g. Armor Penetration would have to be stronger the more strength you have (since the more strength you have, the more DPS you gain by 1% less armor).
How exactly those numbers are created? I dont know. I worked my own numbers but i am absolutely sure. The more strength you already have, the better armor penetration gets in relation to strength. And there will be a point, were strength will not be as good as armor penetration. The questtion is if this is possible in ulduar gear or in t9.
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As Kahorie explains in the sim thread, the EP values for each stat are derived by running a "dry run" sim with your provided stats, and then running a sim for each individual stat, adding 50 to it and calculating its contribution based on the difference in dps. Because there are a number of other factors that can cause a variance in that dps, the results will not be very consistent unless you run a ridiculously long sim and isolate all other possible variables.
The EP values calculated this way should really be taken as guidelines for gear choices, and not precise values. As tetracycloide pointed out, we know that Strength should have a constant value in relation to Attack Power, given the same buffs. Armor Pen gets better the more of it you have, but it also makes Str/AP better as well, and more Str/AP makes ArP better. To make ArP as good as Str, you need a high amount of Str, which still indicates that stacking Str is the best strategy.