Cost reduction by eliminating vias from PCB design
Centuries ago, when I first started designing PC boards, I believe we were charged for the number of vias/holes (or number of different hole sizes) on a board, but that charge was dropped long ago.

There may be an extra charge if you have an excessive number of holes - like for a board matching the hole pattern of a plastic breadboard - but there is not usually a per-hole charge for "normal" PC boards.  (However, this may depend on the board shop..)