[io]

You want me to pay extra for the privilege of having junk mail delivered? I can't see this being a very popular option. Sorting through the junk to make sure I catch the rare piece of important mail is a chore. I would pay extra to opt out of all mass mailings, and have the occasional piece of actual mail delivered. They'd probably only have to open my mailbox 5-6 times a month. Win-win.

[IgorPartola]

The amount of junk mail will go down. Since nobody is willing to go and pick it up and then will actually discard junk immediately at the pickup location, the value derived from sending junk mail will go down. Thus there will be less of it sent out.