There's a parellel in the early expeditions to Pompeii or Troy which did a lot to destroy the sites in question and destroyed a lot of knowledge in the process.
edit: corrected a number. Also, I looked at "employed" meaning full time or part time research vs. just having a PhD in it. Like physics PhDs are 58K which sounds about right, just few actually get a faculty position, temporary (post-doc, staff scientist) or otherwise.
As for why I say both, the number of positions tends to also put downward pressure on number of applicants I think and makes it more likely people who study it or consider studying it consider other fields or jobs before even applying.
I’m not saying it was unworthy or worthless, but given the limited amount of resources and grant money to go around, this cave may simply have been neglected in favor of the others.