Aesthetics or authenticity?

Hi People

Kamer takes a very clear position on authenticity as the primary consideration in determining the importance (and monetary value) of African art work. Here is a quotation from his text:
It is evident that a mask made a few years ago, or even today, for the purpose of tribal rituals is an authentic object which has infinitely more value than a 100 year old mask carved on order for a local functionary or as a gift to a governor or a European visitor.

While authenticity is a very important factor, I think he overstates his position (and I don't think things were different in 1974 than they are today with respect to the relative roles of authenticity and aesthetics in tribal art). How do others see this issue?

Regards

Steve Price