They have grounds to suspend your account but no real motive. Amazon has suspended a few accounts. They were folks who entered a bogus address and were using a foreign credit card, not gift certificates, and bought many books at one time.
Realistically, the companies would rather sell you stuff than not. So if you do a moderately decent job of masking your account, a real address (pick a business or home address from google), use gift certificates (not traceable to a foreign account), and use something to hide your ISP you are probably going to be fine.
That said, if I were over seas doing this, I would make darn sure to download any book I bought to my computer so I had a back up of it just in case my account was locked.
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