Not sure what you think you're proving by comparing apples to oranges. Deadpool, Harley, Carnage… all hugely popular, sure. But their first appearances had much bigger print runs than the book in question here, so are much more widely available. I wouldn't put X-23 in the category of the other characters, but even so, same situation regarding availability of 9.8s. Kamala's situation is a little different with so many different books to pick from for key firsts. That leaves Gwen as the most comparable. Very popular; I'd argue not quite as popular as Miles. Has appeared in a movie but not been the title character. The Land variant is approaching 5 figures in 9.8, and there are more than twice as many of them on the census as the UF4 variant. Now, maybe the prices for both of them won't keep up. But I think whatever price correction those may be subjected to in the future will also be reflected in the 667 variant. My long-term pick is still Miles.