The RCR grade is pretty subjective to the grader and because they need to complete the grading during the show it is more a quick judgement than following a set rubric. As a buyer I don't give any additional consideration towards a RCR card versus a raw card.
I focus my PC on Ken Griffey Jr but I also collect Jay Buhner, Steve Largent and Ryan Bader. Secondary collection: Seattle teams & Univ. of Arizona