Pretty much every professional comics creator I know is a massive comics nerd. They love comics. They love talking about and dissecting comics. They either devour tons of comics, or at least used to read a lot and bemoan that working on comics gives them limited time to do so.
I think there are circumstances in which somebody could make a successful comic without being into comics, but they're quite odd and specific, like: "It's a gag comic with simple art that more leans on excellent writing, something like xkcd", or "The creator isn't into comics, but is VERY into a related thing, like film storyboarding or animation." (I can't imagine why somebody like that wouldn't like comics though...). It feels weird to me, personally. I learned so much about how to time jokes from reading things like Scott Pilgrim and Azumanga Daioh... and also... Making Comics by Scott McCloud is a comic! I feel like making comics without having read "Making Comics" is completely ridiculous, it's like... I dunno, it'd be like being an animator who's never read "The Animator's Survival Kit" or a Games Designer who's never read "The Art of Game Design", it's practically mandatory reading!
But even outside of just how reading comics shows you what to do and what not to do, helps you find your personal storytelling style and stuff... it's important because it helps you know where your comic fits and where your audience is. I don't think it's very likely for a person to make a popular comic on Tapas if there's not a single comic on Tapas with over 10k subs that you actually enjoy reading. How can you make a product an audience will enjoy if you don't like any of the things they like!? How will you know who to market to and how to market it without seeing where your work fits?
And then there's another thing which is... comics are exhausting. They're so much work. I can't imagine making one if I didn't just absolutely love comics and think it's a wonderful medium, and love to have books of my own comics on my shelves alongside books of comics by friends and people I admire. They don't make a lot of money, they rarely result in a lot of fame... why make comics if you don't love comics!?