Lost sales are still lost sales and may be the margin between keeping the doors open and not keeping them open.
Have you ever heard of an "impulse purchase"? Those are an important source of income for any store, and impeding them (in this case by having radically different versions of the characters in leading books) is bad for business. They've gone to the time and trouble of seeking out the book, clearly showing an interest. Why throw one more obstacle in their path?It implies a few things:
1) Movie goers have zero understanding of the comics and their relation to films. Almost like they didn't know what a comic book was before they ever saw the end credits of a comic movie and just assumed Marvel was always some sort of minor movie production company that just made it big about ten years ago entirely by accident. It also implies that not one moviegoer who is interested in comics can internet search something.
Then why did they take the time to come into the store and take a look in the first place?I imagine for those who see the movies, they've probably seen many news articles talking about differences or histories or other such. I can't imagine they've been completely devoid of any concept of differences between comics and movies. Most likely I think they're just not interested in buying comics.
Not the sole cause, perhaps, but an important enough one that retailers are reporting it as one. Lost sales are lost sales. I trust retailers to know what is happening in their own stores far better than I trust remote analyses by self-serving Marvel.2) The Direct Market is this weird thing that people who do not know what comic books are or what might go on inside them that people have an instinctual location knowledge for, even if they don't know what's inside of one. People who have no clue what they're getting into do zero research of their own and simply go to comic shops. This also is added by the bizarre nature of these moviegoers who instead of using an online source would seek out a comic shop at all when they know of sites like Amazon, Comixology, eBay, or what have you. And it's because of the people who are going to movies and not seeing movie translated comics are causing the collapse of the direct market industry wide.
And yet they make a point of referencing them as a significant factor...I imagine economic reasoning combined with the availability of online retailers affects DM sales more than movie goers do.
Ultimately, their internal motivation doesn't matter. The facts are that they a) took the time to go into the shop, b) looked for specific titles based on a perception from immediate previous experience as to what they would contain, and c) left disappointed when that expectation was not met.3) That these people were heavily inspired to buy comics in the first place. It's odd that anybody with only very little knowledge of comics or previous interest would find a movie so thought provoking and soul resonating they would have an immediate urge to go from a movie theater to a comic shop without any stop between to really know what they're getting into.
I would imagine most people who are inspired to buy comics were those who already had an interest in doing so, or were previous comic collectors in the first place.
Interesting that you find stories about an usurper stealing not just Thor's status, but his very name and swanning around having everyone praise them as "better than the original" (even by said original) to be "compelling and entertaining". Same could be said of X-23.
The actual sales numbers suck, and do not reflect what they could have been if those potential new/return readers had not been pushed away by radically different versions of characters in the books. Again, retailers know their shops through direct experience. Their testimonies should not be dismissed as "anecdotes".