I tried Vignette briefly yesterday and this was the problem for me. It’s not the fault of the app. Seems like a nice app but not for me, given what my contact list looks like.
With that said, the way the in app purchase is setup is great. It found very few photos for me, I figured it wasn’t for me and because it doesn’t charge me money until I want to save the contacts, I hadn’t lost a dime.