You are forgetting one very fundamental thing... the miner and his GPUC/MH/day. No matter what push and pull, the market will always settle down to this price range... we can call that the equilibrium price (EQ). If its higher, people all drop their current coin jump to mine this one and sell for that high price till it drops to the EQ price . If its lower, people all drop the coin and go to another coin. This scarcity will have people bidding one other to buy the coin till it reacher EQ range. It would be foolish for the CEO to list prices that are not in this EQ range.
I think you are also missing one point. That most of the other coins have no other real purpose other than just being a coin. Gpucoin has something different, they have a product behind the coin. This creates further interest that most of the other coins don't have.
So what? Other coins can be exchanged for BTC, which in turn can be exchanged for fiat. The BTC is the "product" of value as far as anyone is concerned. I can get amazon gift cards with Noblecoin... doesnt really make a difference (unless I get them cheaper or more profitably)... I could just as well have my rigs pointed at a multipool and use the BTC proceeds to get the gift card. Alternatively, rent them out for the market rate and earn BTC. Similarly GPUC will float around that EQ. Artificially manipulating the prices (by offering the graphics card at non-market prices) will just crash the system. It will either be unsold due to unreasonable prices, or it would be sold out with a loss, leading to an unsustainable business model.