And I addressed that, Jerry. It is clear that spammers have no problem sending spam from home, that the risk of losing an account is not a major cost in spamming. But buying a laptop, an AC adapter, a wireless card and so on -- that *is* a major expense.

Your argument applies equally well to libraries, Internet cafes, kiosks in airports and bus stations, and so on. Should we be worried about what people are getting up to there?