By the time the cost of mounting the cameras in two wingtips (with due regard for aerodynamics etc) and the cost of putting in the wiring (specced to run somewhere near wing fuel tanks) is considered, it would be a LOT more than $45.
Against that though I guess the costs of delays asking for wing walkers or, worse, the cost of actual accidents needs to be factored in. Especially in planes where the wing tips cannot be seen from the flight deck windows it might still make economic sense.