Why Do They Put More Than 1 Serving in Anything?

It's probably a marketing ploy. Maybe it's meant to feed two people?

Take, for example, Campbell's Chunky soups. It's available in a quite large size. I haven't seen them available in smaller sizes.

Or, the other thing, is that it's being marketed to people who want a bigger meal?

It's so that that 60 calorie claim can be made in the first place. It's a far nicer marketing ploy than saying 120 or however many calories are really in there. There are single serving and smaller serving sizes of things, and those tend to be way more expensive per serving. And, people will pay it. E. g. 100-calorie packs. They are a very clever way for a company to provide less yet charge more.