And four monochromes plus a sepia does not in any way qualify as “Bold colors”. Screaming Purple, Bright Orange, Bright Royal, Carmine, Lemon Yellow; those would bold. These are more toward the stodgy and gal-who-likes-her-mancave-dweller end of the spectrum.
And as far as “we sell lots of them every time” being a counterpoint to the vocality they produce, consider that there are tons of people who never read either the description, details, or the comments, or anything beyond the first half dozen words, and who probably also have no idea that “linen” is a fiber that is extracted from the stems of flax, and possibly don’t even know that flax is a plant. And yeah, technically it’s not your job to try to educate them, but it’s polite to NOT intentionally trade on their ignorance, which is what the manufacturer, and by selling it without mention of the deception, you, are both doing.