This is a pretty fair way of Deals.com.au to handle purchases of accommodation packages.
Enjoy the DEALS.com.au Thai Week Booking Guarantee! If you book prior to 24 May 2011 and can't get your preferred dates in the validity period, get your money back".
The hickup would be if whoever takes the bookings is slow to respond to booking requests and you get a delayed negative answer due to no fault of your own.