I'm guessing the GPUCoin price will be pretty close to what it costs to mine. If you have to pay more than the graphics card's price you want to buy - in electricity costs - it doesn't make much sense to mine, right?
You bring up a good point about the power costs. Actually, I had totally forgotten about the power cost to be honest. So let's toss out some data. I can personally ScryptN at around 10Mh, and it will use 7,000w/hr. If I mine for 24 hours, that's 168Kwh. If my Kwh cost is 0.11/usd, then my mining cost was around $18.50 for a day.
Speculation:
Let's say it takes 7 days to mine enough GPUC for a 270 series card. I spent $130 to pay for the electric. How much is GPUC worth at that point? The longer I have to mine for a card, the less perceived market value the coin may have based on electrical costs, because at some point electric will cost more than just buying the card outright.
Perspective:
I can get MSI R9 270's on Amazon for $150 fiat (last week's order).
This would demand GPUC be worth much, much more than it is now.
Your electricity cost assumption is VERY understated. Don't forget tiered electric rates which mining definitely breaches. In California you are looking more at ~$0.34/Kwh.
In the Bay Area you only get $0.13 rates for the first ~330Kwh per month which you will breach within 2 days. Rates then jump to $0.15/Kwh for the next 100Kwh and then $0.32/Kwh for the next ~230Kwh then $0.36/Kwh for the rest. Within a week you will be paying $0.36/Kwh. Triple the costs. With that setup you are talking about expenses of 5208Kwh for a spectacular $1768.78 per month. Mining only makes sense economically if you can sell your coins to offset your electric bill and still have enough hashing power to pocket more coins than you have to sell. At the current exchange rates of 0.000001 for maybe 2.5million coins acquired in a month you're looking at maybe 2.5 BTCs per month income. That is $1562.50 at $625 BTCUSD. No profits. You'll only break even if BTC goes up or the exchange for BTC goes up.
Oh and let's also remember that there is no way you'll actually be able to dump 2.5mil coins lol.