Sniff around comichron and I noticed a trend with the DC POC solo books.
Excluding the Green Lanterns since they seem to stay in the 30ks.
Everybody else keep declining in numbers with each passing issue.
While at Marvel (I'm using only Black Panther, Miles & Sam)
They varied in ups and downs.
Cyborg from Rebirth issue to now lost 53,220 issues.
Blue Beetle Rebirth to now- 61419
Super Man issue 1 to now 105345
Superwoman issue 1 to now 77900
Of the DC 4-it took Superwoman the longest to get below 17K. Yet in 2017 she has had the biggest drops of the 4.
To be FAIR-
Black Panther dropped 7K after issue 12
Miles dropped 12K after issue 12
However neither have gotten below 25K
Miles has stayed in the 29 and up
Panther has varied
Sam Wilson ended at 17818 and that was his second lowest of his run. Issue 20 was the lowest 17496.