You can buy houses and change the rent to whatever you want, then make sure you aren't connected to xbox live and you haven't patched your game (I don't know how to remove patches). Now go to your xbox dashboard and go to the clock section of settings, put the date forward a year and go back to fable 2. Wait a few seconds and a large sum of gold should appear over your head. Repeat as much as you want.
You cannot remove patches. And if you have any of the downloadable content then this WILL NOT work. Because you require xbox live connection in order to load a game save that has the new content. Also note that there are many many jobs in Fable II that allow you to make money easily, Bowerstone Blacksmith will allow you to make up to a 1000 gold, per sold, once you get to MasterSmith.