[jeanlucas]

Well, what should they compare it to then?

Good has a value much higher than its use and most of its current value is just the faith that it is a store of value.

But I don't find odd comparing gold's return to s&p

[lottin]

It could be compared to other assets in the asset class of assets that have no intrinsic value (e.g. other crypto-currencies). I think that would make sense.