Yes Fergie that sure could work , but the bottom line with email service providers is they also make lots of money sending out offers of this that and the other ,MSN and Hotmail in popular , When someone clicks on one of their offers and goes to the sellers site to purchase stuff , then the email provider gets a share of the sale.
But if some new company was to set up an email forwarding service with no adds. or promotions and charge 1 cent,,,,well there's an opening for someone.

Billions of cents a day,,and no more spam , junk