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Yeah, I get that. I think just a terminology thing. It seems like you're using "casual" to describe your mindset whereas I'm understanding "casual" to be offhand, or without significant investment. Forgetting about the absolutely massive time investment, spending > 2000$/year on running shoes alone is a distinctly not-casual thing to do.

> it’s not so different from that of all the other casual marathon runners out there

Maybe this is the disconnect? People who have ever run a marathon at all are < 1%, and people who continually run marathons casually are a niche within that niche. If the audience is "people who run more than 50km per week" then I think "casual" probably gets the right idea across, that's just a teeny tiny audience.