www.elitefourum.com/t/psa-8-5-grading-anomaly-december-2016-january-2017/18738/1
PSA 8.5’s are a joke of a grade. I’d rather an 8 because I know it to be a more valid, reproducible grade, not just the victim of PSA’s stupidity. Honestly all half grades at PSA are a joke.
I’m sure on more liquid highly traded cards they’d garner a premium over PSA 8’s but for most they just are not going to be come across in searches naturally. Most collectors go for 8, 9, or 10.