That may be true that wolf blooded mortals are popular but on the same token they pose a significant risk for their existence.  They can be interrogated to the point of giving up information on the pack, as well as being opposed to the pack itself.  Its a very very thin line of trust when it comes to wolf blooded mortals.  This would be why everybody would be cautious when meeting with a wolf blooded, especially one that already knows of the packs existence, and they know little or nothing of the mortals.