I just went to my nephew's wedding. It was a meeting and merging of not only him and his bride, but of the two families. They are of two different races and cultures, and they did rituals from both cultures (he is Jewish and she is Chinese). Sure, I may never even see her relatives again, but I got to meet my now extended relatives. It feels good for the couple to know they are supported by the whole family. We all gathered to support them and wish them luck. The cost of the wedding doesn't matter.