I fear that words like "easy" or "expensive" in this realm are difficult to evaluate objectively.
Weddings, for example, are not expensive, if you consider them as a bureaucratic act: in most countries, it's just a few forms to fill him with minimal fees attached. However, if you impose on them oversized cultural expectations (which come from "netflix shows of the past"...) of white horses, diamonds, banquets and so on, then yeah, it's an expensive act. Maybe, if one wanted more weddings, one should support reducing some of these artificial obstacles...?
> a sizable segment of the population thinks the idea of marriage is “uncool”
That's always been true, as showed in literature of the past.