It’s no surprise Ken Griffey Jr. appears multiple times in this month’s run. His cards are approaching the untouchable echelon for many collectors.

Nolan Ryan 1993 Finest Refractors #107 PSA 9
Sold: August 16, 2017
# of Bids: 19
Final Price: $3,049.11

Ken Griffey Jr. 1999 Metal Universe Precious Metal Gems #95 PSA 9
Sold: August 16, 2017
# of Bids: 37
Final Price: $1,380.55

Cal Ripken 1996 Select Certified Mirror Gold #139
Sold: August 27, 2017
# of Bids: 19
Final Price: $1,350

Ken Griffey Jr. 1993 Finest Refractors #110 PSA 9
Sold: August 16, 2017
# of Bids: 36
Final Price: $1,175

Derek Jeter 1998 Donruss Signature Autographs Century #63
Sold: August 14, 2017
# of Bids: 24
Final Price: $482

Ken Griffey Jr. 1998 Pacific Omega EO Portraits 1 of 1’s #7
Sold: August 19, 2017
# of Bids: 22
Final Price: $449

Juan Gonzalez 1996 Select Certified Mirror Gold #56
Sold: August 3, 2017
# of Bids: 9
Final Price: $442.99

Paul Konerko 1998 Donruss Preferred Precious Metals #26
Sold: August 18, 2017
# of Bids: 14
Final Price: $404.09
Konerko and Hershiser sales dont make sense
I believe those results can be chalked up to the existence of set collectors.