having everything come back to money is a good thing though - a user can afford to pay e.g. 1 microdollar per email sent but if a spammer is sending 10 million

having everything come back to money is a good thing though - a user can afford to pay e.g. 1 microdollar per email sent but if a spammer is sending 10 million emails a day, they can't afford that level of operational expense.