Furthermore, this applies across the board, so customers who have never received any junk email at all are still helping to defray the costs of the ones that do. Spammers WILL stop. Nobody doubts that. The only question is whether they will do so before or after destroying the net, like any other parasite that dies after killing its host. That last lie has led to several divorces, several firings, and at least one suicide.
Lies have consequences.
My on-line mailbox can hold a maximum of 50 email messages. By invading my mailbox with unsolicited advertising, the spammers are capable of depriving me of the email I desire receiving. We are perfectly within our rights to block spam traffic or to request other ISPs to terminate spammers accounts within the scope of their TOS policies. That doesn't mean private citizens and organizations can't seek to deny him a forum. Also, there is plenty of precedent saying no one has a right to demand that others provide the forum for their exercise of free speech.