And as for why you can't buy September contracts, it's because the site is neglected by the dude who runs it (KultofCows). They need to be added (along with an IPO). It's difficult to add them too far in advance, though, because it's tough to predict what will hit the NPD top 10 (since we don't get hard numbers for games that didn't make the top 5/10).
Use the "Contact Us" form under "Help" to complain if you'd like.
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NPD doesn't report PC games.
And as for why you can't buy September contracts, it's because the site is neglected by the dude who runs it (KultofCows). They need to be added (along with an IPO). It's difficult to add them too far in advance, though, because it's tough to predict what will hit the NPD top 10 (since we don't get hard numbers for games that didn't make the top 5/10).
Use the "Contact Us" form under "Help" to complain if you'd like.