Well, professional apps like 3D rendering software and video editors will like the Core i7. Gamers though will really not benefit from the overkill.
In order words, home users don't need it. These kind of workhorses are used commercially. How many home users need that kind of performance? Even if you really do 3d apps or video editing at home, your apps must support multithreading, and HDD can be a major bottleneck for these apps, which means more moneh!