Why does it have a VGA port instead of a DVI port?
Everyone has different levels for what "expensive" means. You can get new HDMI monitors for well under $150, and new DVI monitors for well under $100, and DVI<->HDMI adaptors are under $10.
~$100 for a monitor (which can also be used with other computers) isn't expensive when we are talking about a $50 board.