Guest83,
Here's a simplified example to illustrate why Impulse, GamersGate and others are taking a stand against Steamworks games.
Imagine you go to Mom & Pop Electronics Store and buy WidgetX. As soon as you bring WidgetX home and begin to use it, a Mega Electronics Store opens up across from your house that also sells WidgetX, along with many of the same products you could get at Mom & Pop Electronics. On top of that, every time you use WidgetX, Mega Store might toss a promotion at you for WidgetY or WidgetZ. All of a sudden, you have a store that offers you many of the same products as Mom & Pop, only it's right there across the street. They even promote products directly to you from time to time.
Would you still drive over to Mom & Pop, or would you just go across the street to Mega Store?
What incentive is there for anyone but Mega Store to sell WidgetX if this is what always happens?
Selling a Steamworks game, that bundles the Steam client (and store by extension) might get us sales in the short-term, but it would be harmful in the longrun. Why buy a Steamworks game anywhere but Steam if every other store just sends you there in the end anyway? Would Target sell product vouchers to redeem at WalMart?
Also, your continued assertion that we should just sell a Steamworks title for a few bucks less than Steam simply doesn't work. Publishers and developers set the pricing of their games to be consistent across all sales locations (retail, digital etc). We could not simply cut a few dollars off of the price, that's now how things work.
I understand that from the outside, these kinds of things can appear arbitrary, especially to those who aren't actually involved in the process, but these decisions are not reached lightly, and we don't sacrifice long-term stability for short-term dollars.