Luckily for you and for GPA not all major dealers/auction houses report.
Bob Storms had not 1 but 2 Batman 1s listed on his site a few months back. Go find them or click on the link in the article.
https://itsalljustcomics.com/2018/03/14/highgradecomics-com-lists-batman-1-cgc-1-8-for-125000/
Oh ... that's right ! The listing(s) is(are) no longer there cause the book(s) sold.
Btw, this 2.5 had recently received at least 1 public offer of $106,000 and it was not accepted. Why would seller settle for your offer of 85K then ?
Just as it is in your right to offer what you want (please remember to do so privately), it is all within the seller's right to ask what he wants.