Don't take it personnaly, but that's really very dumb math for several reasons :
1- You're trying to calculate unit solds/price/revenu considering the way price impact sales is a straight line. It's NOT. It's a stair. You don't sell just 2 times more console when its price of 400$ decrease to 200$, but 3 or 4 times more for a certain period of time (depending on period/value and even games). It's a matter of psychological threshold (see point 2) and revenus.
2- You're not considering the fact the psychological threshold is different for each machine. The price of 300$ you would NOT have the same effect on each machine. It would make the PS3 ultra appealing (not just for games but also BR, because it will be almost cheaper than HD-DVD reader, and cheaper than any BR reader, which isen't the case). It would make the X360 slightly more appealing (cause with pack & discount, it's almost at the same price) and it would make the Wii less appealing (cost more). So buyers won't react the same way and figures won't be the same at all.
3- You not considering that having a 300$ price for each consoles at the same time would probably imply they would be different. Wii would be more powerfull, X360 might be the same, PS3 probably won't have BR. So once again, their value and appeal won't be the same.
4- You're using as a base figures which are differents in many ways : not the same period (18 months to 6), not the same situations (world wide launch, 2 times launch)... It's considering that a 18 months life span show the same linear progress than a 6 month life span. Of course, that's stupid, since the usually big launch sales are way more diluted by the average daily sales.
And of course, we're not talking about the impact of games, the variation of sales this price could imply in low revenus countries (where you can find the X360) and a bunch of other stuff.
Point is : this math is worthless and completly dumb.
And so am I wasting my time to explain that.
Edit : Oh, yeah, and I forget. What's make you think a lower price will translated into bigger sales for the PS3 ? I mean, look at japan : the 20 Gb is at 400$, the 60G is at 500$... for official prices but many shops are already doing 20% discount, which mean you can get a PS3 20 Gb at 325 $ or so. And now, look at the sales...
