Why Pay Full Price for Running Events with Schwaggle?

Active.com recently launched Schwaggle, which is their version of Groupon for running events and fitness related activities, services and products.

To date, I have seen the following 2 events among several blow out heavily discounted entries:

100th Bay to Breakers 12k

100th Bay to Breakers entries were blown out at 50% off.

2nd Oakland Marathon Events

Oakland Marathon entries were blown out at 47% off with an option to downgrade to the Half Marathon event. 

For events which have a history of poor reg. #'s, why bother to pay full price next time around or ever again?