I enjoyed having an engagement ring because it reminded me of my FH. We were dating long distance, really long distance across the continent. I actually felt bad for my husband because he didn't have one. He totally had ring envy. It was so bad that I actually did a reverse proposal for him on Valentines Day and he started wearing his wedding ring then because he just couldn't wait. I know in some European countries they have engagement rings for men and I think they should start that up in North America.
I think it's cool she did something that is symbolic for them.
My thing is, it isn't the ring. I wanted a ring and my husband wanted to get me a ring because we both felt that was a way to symbolize our love for each other. (He's actually said if something ever happened to me, he would get a tattoo around his finger instead of wearing a ring because "I would want something permanent that would remind me of you every time I looked down. I could just take a ring off; a tattoo wouldn't be that easy.")
It isn't about what it is, it's about what it symbolizes. I can see how someone who has infinite ability to buy her own material stuff wouldn't find symbolism in a material thing.
But then, my grandfather's symbol of engagement to my grandmother was a hand-carved ivory, mother of pearl and turquoise hair comb. So it's all about perspective and what you personally want to symbolize your love and commitment, if anything at all.