"If for any reason any portion of the prize is delayed, cancelled or
postponed, or becomes unavailable, Sponsor reserves the right, but is
not obligated, to cancel or modify the Contest in its discretion and
award a substitute prize of approximately equal or greater value."
When you write the rules you can make words mean what you want. For a
5000 dollar prize, 90% of it being given back to you would be
approximately in a lot of people books. Not in mine, but I am sure
those that wrote the rules would consider that approximate.