You benefit from the attempts on his children's lives. You benefit from having no mother-in-law lording over you, telling you what to do - you're practically queen now, and there's no one in that position to challenge your ego. And isn't it convenient that there was something at the reception to distract from how utterly miserable the prince looked?
I can think of several. For instance, helping those who weren't as fortunate as you were, being born with a silver spoon up your arse. Or maybe taking a look at the world around you, the world you'll unfortunately be ruling some day, and getting to know your future subjects. All of them, not just the ones you deem worthy enough.