i think i got it now...

so, if 1 silver and 2 gold is not fair to the guy using the silver crown, because he can`t know if he`s using silver (2) or gold crown (3)

the option 2 isn`t fair too

the option 3 is the unique valid fair to all 3 guys

So all 3 guys using a Gold Crown..., and the clever guy who notice that and said he`s using a Gold Crown