Flipstarter is made so that as soon as the qualifying amount is pledged, it pays out. There is no need to wait. All the results are still there though so anyone can go see the pledges.
I meant they would collect more from others if they would wait until the last day instead of closing it with their own money.
I see. It's not possible with the anyone-can-pay transaction. It has a fixed amount and anything you try to add over the fixed amount will just go to mining fee.