I guess one of my thoughts was the chance that a significant artifact might end up in a suburbanite living room as a coffee table, doorstop, paperweight, etc....
I mean, they're digging up some stuff that looks pretty important to me (untrained eye, of course).
Also, the name of the site implies some hokiness. When I leap frogged around some links, there were some stories of stuff actually coming into the US illegally which I guess is a no-no.
Shady... yeah, my instincts were right!