Should operator overload methods be virtual?

[Walter Bright]

Making them not virtual would also make them not overridable, they'd all 
be implicitly final.

Is there any compelling use case for virtual operator overloads? Keep in 
mind that any non-virtual function can still be a wrapper for another 
virtual method, so it is still possible (with a bit of extra work) for a 
class to have virtual operator overloads. It just wouldn't be the default.