I mean, is it not your opinion that some stuff should be added that isnt and other things shouldn't be added that are? Blizzard doesn't have to listen, reply to, acknowledge, or even give credit to your feedback, even if it is the most amazing truth-rooted feedback ever presented to them. I'm sure, at some instance where you gave good feedback that wasn't acted upon, whatever you presented to Blizzard was actually a great fucking idea that would improve the game for 80%+ of the WoW population. I do not doubt this for a second that you have the capacity (and likely a history) of leaving good, quality feedback/suggestions.
Where you are wrong is that Blizz isn't forced to act on your suggestions merely because you believe they should, regardless of your degree of correctness on the matter.
I'd argue that, most of the time stuff isn't implemented, it's not because Blizz didn't want to do it.
See: New player models, the proposed DotA bg, item upgrades in 5.0, etc.