For the most part, comics are bought and sold on expectations. Whether it's seeing the fame and prestige series like Watchmen have and wanting to see them for yourself, or merely loving the goth vibe of Batman and needing to experience it firsthand.
However, often you'll open a comic expecting something, only to be met with something entirely different.
The tone can be completely different, or it can prove adult and edgy where you were expecting a family-friendly series - hell, sometimes it's just that it's from a franchise that you've already read, watched or played, and yet it feels entirely different to everything else.
While this can prove a disappointment if you were really hoping for a specific thing, it's also just as often a welcome surprise, like finding money you'd left in an old pair of jeans. Unexpected gems can feel all the more special for the shock they bring, especially if you're no stranger to the world of comics.
Batman will always be grouchy, and Iron Man will always be smart, but not everything in the wonderful and strange world of comics will always be as straight-forward.