Given that most doctoral programs in psychology have more applicants than openings, it is understandable that programs would focus on higher GRE scores which predict program completion better than lower scores.
References
1.
Educational Testing Service. (2002) Graduate Record Examination. Princeton, NJ: Author.
2.
HolmesC. B.BeishlineM. J. (1996) Correct classification, false positives, and false negatives in predicting completion of the Ph.D from GRE scores. Psychological Reports, 79, 939–945.