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Spammers often forge the delivery headers of email to disguise where they are sending it from.
Large amounts of this junk mail can clog mail queues and seriously affect the performance of the computer that delivers your mail. Moreover, the heavy traffic caused by mass electronic mailings makes the Internet and local networks more congested. Some system administrator, somewhere, is probably dealing with a spam-related headache right now. On the other hand, the spammer pays virtually nothing. In fact, since spammers often hop from free account to free account in order to avoid detection and keep operating overhead low, they don't even have to pay for their email accounts.