Nobody wants the hallmark of their wedding to be how bad the food was. So they spend and research accordingly

Joy and ease are ingredients that make any food taste better but no chef can get them in, you do bring them yourself.

Free food always taste better

just speculating, but maybe BECKY demanded the high-end ingredients that the caterers provide for her wedding and not the stuff you get in Chinatown (not that those aren't just fine of course)