Custom Orthotics for Running?

This morning I saw the other doctor at my chiropractor's office. I guess he's more into feet and soft tissue work. He evaluated my feet and legs and pretty much the only problem he found was that my right IT band is a little tight compared to the left. I'm having zero pain in my feet, ankles, legs, hips. Nothing. But he recommended custom orthotics. I asked why and the answer seemed to be "because it's better for your feet/legs and your running in general." But I don't have any pain, so why fix something that's not broken? Does anyone else wear orthotics? Why? Do they help you? How?