Just realized after pressing vote that I completely misinterpreted the question.
Voted for 2. As in I own a Black Reach set and an Island of Blood set.
But I've got 3x the Orks from
AOBR (+1 rulebook and whatnots) and I recently bought the Island of Blood set but sold the models to my buddies.
Also I've got half of a Gorkamorka starter set. So I've got... what? 2 and a half sets?