"A big part of the reason is that nothing is really making use of these latest/greatest desktop machines."
Are we talking about playing at the the lowest possible settings here? I would love to see you play:
Supreme Commander 1 & 2,
Dragon Age: Origins,
Fallout 3,
Fallout New Vegas,
Mass Effect 2,
Metro 2033,
S.T.A.L.K.E.R. Clear Sky,
Arma 2,
The Chronicles of Riddick: Assault on Dark Athena,
Warhammer Online,
Risen,
RIFT,
Borderlands,
Company of Heroes,
Aliens vs Predator,
Empire: Total War,
Far Cry 2,
or even some of your own company's games that are a few years old now (Sins of a Solar Empire, Demigod) at their maximum settings. "Maxing" the video settings would be making use of what the game has to offer graphically, correct? I'm being merciful here and not mentioning Crysis at Maximum settings (also a game a few years old now). Try playing that on your 2010 Dell desktop at a playable frame rate.
I've recently upgraded from Dual 1GB 9600 Pro's in SLI, to a single Geforce GTX 460, and I've noticed a massive increase in performance across all the games mentioned above. That said, I'm comparing running those games on my 9600 Pro's at roughly "medium" settings to running those same games on my single GTX 460 on maximum settings. Admittedly, my processor and ram are roughly 2 years old now, but using a slower processor with a newer graphics card has its own inherent problems with not utilizing everything the hardware has to offer.
Sure, there is an exponential growth curve, but saying that "nothing is really making use of these latest/greatest desktop machines" is very uninformed--more than a little glib--and shows me you have done little to no research on newer hardware as well as the games of your competition. Furthermore, have you heard of Nvidia's CUDA technology? Quite frankly, I'm appalled any game developer would make such an uninformed comment, but from your recent "success" with the release of "Elemental: War of Magic," and "Demigod," How can I really be surprised?
There are plenty of graphically demanding games out there, specifically those that utilize DirectX 11 and tesselation. Look them up.