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As a matter of fact, I'd prefer buying a real book at a convention, not an ebook! But perhaps that's just me…
The survey box isn't working for me, so I'm going to answer here. I go to cons for interaction with authors, and come back with stacks of autographed books. If I were going to buy an e-book, it better be something damn special (I know one author who has flash drive jewelry with her book on them). There's no point in bothering to get it at the con if you're not taking something real.
I'm with the above commenters… As much as I enjoy reading ebooks, when I go to a convention to meet authors, I want the real hard copy book for them to sign and to keep forever and ever.