Why are DC's minority character's lagging behind Marvel's?

[Samm]

DC
Green Lanterns #28 -- 30,024
Green Lanterns #29 -- 29,451
Bane Conquest #4 -- 17,615
New Super-Man #14 -- 12,339
Blue Beetle #12 -- 11,574
Cyborg #15 -- 10,949

Marvel
Captain America #25 -- 40,428
Spider-Man #19 -- 30,387
Black Panther #17 -- 25,609
Totally Awesome Hill #22 -- 24,995
Infamous Iron-Man #11 -- 24,676
Ms Marvels #21 -- 17,010
Luke Cage #4 -- 12,330
America #6 -- 9,548
Moon Girl #22 --7,466

So recently I got into a debate on social media about DC and Marvel's treatment of their minority characters. Somewhere along the way some fans started to claim that DC did diversity right while Marvel' s way felt more like an agenda or fulfilling a quota so to speak. Others felt Marvel's approach was correct and more successful. That got me curious to see which claim had more merit. To my surprise the second claim can actually be backed up by factual sales instead of ones opinion.

I listed the comic sales for the month of August above. As you can see, Marvel's roster of minority character's is in a much healthier position than their DC counterpart. Now of course there are exceptions, Green Lanterns is in a healthy position whereas Luke Cage, America and Moon Girl definitely aren't. However the fact still remains, DC's are not only at a lower issue number but also much closer to cancellation.

My question is why do you think that is? Why is their such a wide gap? Marvel has a few minority characters at 100+ solo issues (Shang Chi, Luke Cage, Black Panther) and some newer ones at 50+ (Miles, Miguel, Ms Marvel, War Machine) but DC has none at 100+ (unless you count Kyle who was reconned to be Latino) and their 50+ character's will likely never see a solo again due to fanboyism (Cass Cain, John Stewart, Steel, Static... Blue Beetle Is the exception here).