Earlier quoted context omitted.
csallen, thank you for thinking of making a list! I do have one or two more reasons to add to your list. 1. Cognitive dissonance reduction: he spent so much, so to avoid cognitive dissonance he's going to tell himself she's worth it. Helps keep marriages together. It is the same reason that hazing ritual happen in college and why secret societies have all sorts of strange initiation rituals, often hazardous or diffic…
An anecdotal data point: a friend used to work with a man who had married right out of high school, as had most of his classmates. At that point, probably 15 or 20 years out, this marriage was one of the few still intact. The man's observation was that in this group, the length of marriage was inversely proportional to the cost of the wedding.
That happened thirty years ago and we are still happily married with three kids, two of them in college right now and one in high school.