This is a big ploy to get people to do a big download before they're sure if they want to buy, as well as to ensure simultanious availablity to maximise the number of purchases that will be made before anyone can play it long enough to bad-mouth it. For the pre-loaders who weren't sure, the reviews will have to be pretty bad for them to just dump that DL that took them days to obtain; in the end, they'll pay.
That's a smart idea wetwired but I have a feeling that people willing to actually download it, would play it anyway but
I don't think that you downloaded all the files.. they know people can hack it.. so instead I think they only let you upload textures, most files etc.. but none of the important files like.. hmm.. guns etc?
If they left anything out, it can't be more than a few K, since the whole idea is to get as many people playing simultaniously as possible, and I don't doubt that some of the users are on dialup.