Just look up all the healthy properties of silver. It's amazing!
That's the main reason to have and, well, use silver flatware.
Obviously, if you don't care then you don't need it. (Not that I'm using it right now. Ha. But I grew up on a family where only silver was used.)
It's really weird that some people have silver flatware but only keep it for "special occasions". What's the point? It's like having a Brita filter but only use it for special occasions.