There is certainly a moral and scientific recourse to oppose these sales but, at the moment, not a legal one.
Hone acknowledges that hunting for and subsequent selling of dinosaur and other prehistoric fossils is a lucrative business. He implores, in the name of science, for everyone–governments, auction houses, buyers–to be more responsible. He also points out the hypocrisy that exists:
It’s perhaps ironic that laws to protect fossils sites and the exploitation of our own natural treasures are in operation, but that it’s fine to sell off material that must have exploited those of another country.