Luxury is a loaded term, I probably should have used something less vague. The examples you gave are still luxuries even if they're only $10 more than the basic version - the cheaper plane ticket still gets you there, the cheaper wine... I'm not really into wine, expensive wine doesn't taste especially different to me... still gets you drunk?
Google still returns search results. You have to crawl through ads or search in different ways, but your result is still going to be in there. So if Kagi is a price and has extra comfort, it's a luxury.