The other thing to consider is that alot of the figure for the original halo are those that shipped with the original XBOX, so how many people actually BOUGHT the game. Sure this is like ATI's HL2 bundle, but it is relevant to the original HL because there was nowhere near that benifit to it's sales.
And it's not like Halo is going to ever catch up to the original HL because those 5 million over 3 years is not constant over 3 years you could pretty much say that with the release of Halo2 that the original is gonna push a few new sales for people wanting to see the original, but overall Halo's run is over still 5mil short of Half-Life.
And while like you say games usually come down in price, HALO's launch price was virtually nil, so how do we factor that in?
Now there may be a disadvantage to Halo in that you can rent it from Blockbuster et al, but it's hard to calculate those figures correctly.
Rent or Piracy, those are simply players, not buyers, so tey don't get into the figures. Overall I doubt the original Halo will come anywhere near the HL totals, but Halo2 may initially outsell HL2, but I'd think that'd only be dollar figure wise, not actuall complete games shipped (if you include both online [including ATI vouchers] and retail sales).
I expect HL2 to outsell Halo by a wide margin for another simple reason; unlike Halo 2, HL2 will likely be the springboard for other mods and games, and thus people will buy it simply to be able to play those mods and such.
Of course that's just my two frames worth.
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