Update: January numbers are available. Looks like the PS2 version continues with strong momentum against the 360 version. The PS2 version sold another 60,750 copies to be at 496,750 copies sold in North America by the end of January.
I reverse my previous prognosis that the PS2 version should not trade at a premim to the 360 version. From these numbers, I think the PS2 version is fairly valued. I think Tony Hawk games generally sell a 0.60 modifier outside of North America, so we can guess the game has sold or will sell around 298,050 copies in Europe/Australia regions once the game reaches the same age. That would put the game at about 794,800 copies sold 3 months after release.
Anybody know the ratio of sales to future sales at the 3 month point?
Update: Tony Hawk's Project 8 (PS2) has sold 313,000 copies through December. This is near the performance of the Xbox 360 version. I think there is an arbitrage opportunity between the two versions as the PS2 version is priced much higher than the Xbox 360 version.
VG Charts data says Tony Hawk's Project 8 (PS2) sold 117,500 copies in November. Is there a month-by-month chart of sales for previous games to know how they usually do in the months that follow? How much momentum is needed to 10x the November sales?
The IGN article says that the next-gen versions were okay--the PS2 version (and oher current gen versions) were an after thought. They gave the Xbox 360 version a 7.8 and the PS3 version a 7. The Xbox version got the same abysmal 6.3.
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It looks like past Tony Hawk games generally sell about 60% of their copies in PAL regions, so the game could be at nearly 850,000 copies sold now.
With the long-tail sales, this stock could be on target.