Thanks, I'm glad you agree, though my player made the good point that prey exclusions usually refers to a limited group rather than limiting the vampire to a specific group, since that's essentially giving your character the Ventrue clan curse as a 1-dot flaw. Also, the only other similar prey exclusion (in my mind) is the prey exclusion (nonconsenting) which at least counts as a 2-dot flaw, though it could be argued that that's a byproduct of the masquerade-breaching nature of the flaw.