Once they are found it is important for them to end up in a museum where everyone else can get to see them. First of all, archaeology is the study of human artifacts. Very different from paleontology. Indiana Jones was an archaeologist. Each one tells us something about the past.
Every dig usually fills up some gap in our knowledge.
The most fun I've had was on digs in Argentina and Madagascar. It was in perfect condition. Laying right next to it was the skeleton of a modern armadillo that had probably died the previous winter. Seeing them both together, relatives separated from each other by millions of generations, was pretty neat. I haven't discovered too many.