Quoted from a post I made:
Requires two people
Let us say chris1 and Jiggmin both want a certain map pack but don't wish to spend 15$ or Microsoft Points for all the new maps. There is a way to essentially cut this price in half.
- Download chris1's gamertag to Jiggmin's Xbox 360
- Buy the dlc/download and download it on Jiggmin's xbox as chris1
- The DLC works on all accounts on Jiggmin's xbox as its the original station.
- chris1 recovers gamertag and redownloads on his own xbox, the DLC works because he is the original buyer and the DLC shall still work on Jiggmin's xbox.