Excelent point. Really, the only major competitive advantage I see for it now is micropayments on people's YouTube videos and blog posts, but, although it's easy to pay and to collect, people will still have to go through the huge trouble of actually buying the coins for later donation.

A while ago someone had the idea of setting up a Tor style physical goods delivery system, where each person would be able to get paid in Bitcoin as they pass the package along. Think Mirrored Edge game. The central system would let you register your location, possible routes, and delivery fees, and people would be able to set up deliveries with the system automatically calculating the best relay path among the package runners, as well as distribute payment in bitcoin at every confirmed package hand-off. Each person would only know where the package is coming from and whom to take it to, but never the origin or the final destination.
it sounded like an intriguing system, and may have been a nice way to make some extra cash for people who commute long distances to work anyway, but it seems the project just kind of fizzled out before it even got off the ground.