It's in the fine print of this offer that one must paid the full $2500 at time of booking via credit card and it's non-refundable.
The reason I did the 1k buy in at the Aria tournament was that even last place got the full buy in back at the end of the tournament as free play. The V/P offer of course isn't quite as good and only the first 25 places in each tournament will get the full buy in or more back.