He's not required to pay for it two or three times, but normally, if someone buys a Riopelle, he's buying the pleasure of having it at his home and looking at it. In fact, the work still belongs to Riopelle. The best proof of that is that we don't have a right to destroy an artistic work. In all European countries, they pay following rights. If a Riopelle is sold and resold through an art gallery, that gallery pays 5% of the revenue to the artist or the artist's heirs.
On March 3rd, 2011. See this statement in context.