That's not the real weapon damage what you see there...well on second thought it is but only for auto attacks which are not normalized. Most special attacks have their speed normalized.
http://www.wowwiki.com/Normalization -> info here
Also skills that say on the tooltip "x% weapon damage plus an aditional y" are read as (weapon damage + y ) * 1.x (e.g. for x: 1.3 for 30% or 2.45 for 245% or 1.02 for 2%).
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