One of the important points here is that each price level (aside from the last one) has an allotment of 1250 units. So, while most people won't buy at $625 vs $

One of the important points here is that each price level (aside from the last one) has an allotment of 1250 units. So, while most people won't buy at $625 vs $675, so long as $625 is available, it provides incentive for people to buy now vs later and risk the lower level selling out. Edit: Although, the $625 level is now "1296 out of 1250 claimed" - so I'm not sure what that is about.