And here's an interesting example of how combining the physical and the digital can lead to conflict with the limitations of one medium or the other:
Right before Christmas Activision released a game called “Skylanders: Spyro’s Adventures.” It’s a fairly straightforward adventure game with a twist: it isn’t entirely digital. Collectible figures known as Skylanders can be inserted and removed into the game (via RFID, I assume) to enable players to use different characters as necessary (in my house, usually because the 4 year old has run one into the ground and it needs to rest).
There are somewhere upwards of 30 of these figures, and after the rush of Christmas it became apparent the game was hugely popular because it is now nearly impossible to find these figures. And if you do, you’re going to pay a premium.