The point is that it doesn't matter what percentage of the total they are, it's that 1 is too high without adequate explanation (the Gimli Glider caused vehicles to be guilty of a runway incursion by turning an abandoned runway into an active one, for example).
And the cost of investigating 1,700 should be within the budget.
Of course it matters. All of these entities have limited budgets and personnel and almost unlimited ways they could apply those resources. They have to choose what to chase and they do that by deciding how big of a problem it is.