Because of the low production numbers for any V11 Sport compared to most other bikes they all seem rare.
Like it or not the Greenie isn't rare but it's the most iconic and most recognizable V11 Sport, hands down. It's the one that was always displayed in the magazines and any propaganda.
I'm now getting tired of saying this but here it goes, rare does not equal value. Desirability = value. So those limited production run V11s aren't valuable unless they are desirable to someone.
For some reason the most desirable thing about a Guzzi is how it rides and that's the one thing you can't describe to someone unless they have ridden one. That's one of the things that keeps Guzzi from selling more even today.
But there is always the buyer who buys on only one thing, condition. And they will always pay the most.