8-9k is really good for most ICC fights. So don't sweat it. Most anecdotal reports of 10k dps by enh shaman are exaggerations. The ones telling the truth are probably talking about Sauerfang or other fights where you do nothing but stand still and dps. Sure, if you're decked out in ilvl 277 gear and getting Tricksed by rogues, you can do some pretty awesome dps. And of course, you can RNG it and have 90% of your LBs be crits on a fight now and again. But this is not the norm.
As was said a few pages back, unless you're completely ignoring your other dps responsibilities (oozes, bone spikes, valkyrs, adds, etc), then you aren't going hit 10k or beyond regularly, let alone effortlessly.
I can hit 10k on Sauerfang and Toravon. But if you're talking 10k on Lich King or whatever, good luck!