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Also, I loved B&H when I was seriously into photography, and even if the closed days had been a practical inconvenience (they weren't, IME), it would've still been worthwhile.
Speculating... Maybe something in the culture of dutiful adherence also helped them to provide such well-respected service at great prices? Diversity is good.
Sure, it’s a minor annoyance, but compare that with the nontheistic amorality of Amazon and their everything-goes train wreck of a marketplace (worse than eBay at its worst) and you’ll understand why I only buy my computers, electronics and photo gear from B&H.
Similarly, building the e-commerce machine obviously can't be done on the sabbath, but if it's already running then you're not actually working.
For example, suppose you push a rock off a huge cliff. If the rock tumbles for a full week after you push it, were you pushing it off a cliff for the full week (including the sabbath)? Or did you only push it the one time on a tuesday?