score:0

Solution, following @Core972 comment:

We can fade out the element but changing the opacity of the element: http://jsfiddle.net/BlackLabel/Lzgexfvo/

plotOptions: {
  series: {
    events: {
      legendItemClick: function() {
        if (this.legendSymbol) {
          if (this.visible) {
            this.legendSymbol.css({
              opacity: 0.4,
              filter: 'alpha(opacity=40)'
            });
          } else {
            this.legendSymbol.css({
              opacity: 1,
              filter: 'alpha(opacity=100)'
            });
          }
        }
      }
    }
  }
}

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