A common problem is that people simply don't pick up the marketing mail (or worse, drop it on the ground next to the community mailbox). It piles up until their mailbox is full, and then the local postal worker knocks on your door and reminds you to be a nice person and pick up your mail.
That seems like a great opportunity! Put a big recycling bin right there, but before recycling the contents go through and catalog the mass marketing mail that was discarded without being read. Then sell that information back to the marketers. Less waste, more targeted mailings, money for the post office, everyone wins!
Yeah, I'm kidding... though it might actually work.
I could see this leading to some interesting community discussion: "So, who's the ONE guy in the neighborhood that doesn't discard his Visa ads, and is responsible for all the mail we get?"