Using bigger wires makes for more reliable connections FOR THAT PROJECT, but will tend to deform the contacts some and thus make the board less reliable on subsequent projects
When the pay for the event is $42,000, (Los Angeles Museum of Fine Arts Contemporary Art Council Awards Banquet 'Tribute 82' in Paramount Studios Sound Stage 13, with Leonard Nimoy and William Shatner as guest speakers) you can pretty much plan on throwing away the breadboard when the job is done.