Programs can also infer where you did aways from your LORs. I think it is very benificial to have LORs from your AIs (it's a less biased view than your home program). But, they kinda show your hand about the places you rotated, and therefore which types/locations of programs interest you. I posted a more complete opinion of doing all your AI's in one region is another thread The bottom line is that it will likely help you in your local area, but hurt you abroad. The problem I see is that there are a hell of a lot more programs abroad than in your local area. I'm fundamentally an odds player... so I think doing all your AI's in one spot can hurt your chances (this is assuming you're not >260, AOA, Ranked No. 1, 15 JBJS pubs, blah blah... in which case you can do whatever you like without hurting yourself).