Or maybe....they get payed by the camping industry? Or are at least sponsored by it. I know of anime (Bartender:glass of god) that ended a few weeks/months ago that was financed by an alcohol company (Suntory Spirits Limited) so it does happen.The thing I hate about hobby/enthusiast manga like this is when they lean too much into teaching the reader about the specifics of the hobby, its equipment and how to correctly use the equipment.
It's lazy writing, is used as a crutch to pad out the chapter, and reads more like an instruction manual than an actual story.