I visit two comic book stores regularly. One, I have been going to since I was 13, and I am still incredibly intimidated every time I go inside. The windows are blocked off by obscure posters and racks of magazines, the lighting is low, the small space is cramped with shelves, and the staff is not out and out mean but is not particularly friendly either, and I've never once felt comfortable enough to ask one of them a question about anything. I'll remind you that I have been going to this store since I was 13.
The other store I visit is located in Chicago's tourist-heavy Loop area. It's spacey, not just because it has twice the space of the other store, but because it chooses to sacrifice some product space so that its customers don't feel like they've just entered some kind of graphic novel labyrinth. It's well-lit and the windows are decorated sparsely with Marvel and DC superhero cut outs, which I've witnessed real children excitedly point at and then practically drag their parents inside. The staff actually smiles, greets people, strikes up friendly conversation with you, asks you if you need help.
The former kind of comic book store has a certain kind of appeal - it makes reading comics and being into geeky things feel like some sort of secret special cool people club, which is probably why so many comic stores are just like that and why many of their frequent customers prefer it that way. But it's precisely the reason why the industry is dying, because no kid could possibly walk into that kind of environment and not feel like they are unwanted there. Basically, run a comic book store like an actual business that wants actual customers, and not the Super Secret Comic Book Club (NO GIRLS ALLOWED).