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Where's the option for "download them, but I wasn't going to buy them in the first place"?
I picked #3, because I am going to buy the core books of 4e D&D, but that seems like a valid option that's missing. Almost all of my games are online, though, so that'd be enough to kick off a game, or at least work on a homebrew variant for my group, right away.
As cool as some people think file-sharing is, there is just no substitute for the actual hardcopy in my hands. The glossy sheen of the paper, the smell of the ink, the soft whisper of each page as I turn it...
...you just can't get that in a .PDF file, no matter how awesome you are at desktop publishing or how sweet your printer is. I'll settle for an ESD when shopping for out-of-print books, but only after Amazon and Ebay have failed me.