I'm basing this off my current gear level and damage done to the level 90 dummy:
~30k expected damage/arcane
~70k expected damage/aimed
~75.5k expected damage/aimed with piercing included
That's 1.5k per 1 focus for arcane and 1.4k/1.51k per 1 focus for aimed.
With steady focus up my Aimed is a 1.93s cast, however, which is less time than 2 Arcanes and more damage.
That's not the biggest reason though, because those are all sustained damage calcs. The important thing is burst. Spamming out like 8 arcane shots (including thrill of the hunt) takes way too long and doesn't do good burst damage.
The faster I can use all my focus the better my burst is. Especially in Rapid Fire, which does nothing for Arcane Shot but makes a HUGE difference for Aimed.
(And crit rate is whatever imo, eventually you will be blessed by the RNG gods and all you need is 1 string of crits to win. Just keep setting up kill opportunities and one of them will crit.)
Your math is assuming you crit everytime you cast it. Also you're forgetting that for everytime you spam aimed you have to use steady more which reduces your overall damage.
unless you're implying that your aimed shot crits for 150k
Edited by ernest, 28 April 2013 - 08:28 PM.