Hilton HHonors - Doubles miles for S. Am. Hiltons

Got an e-mail from Hilton today. Double miles (for AR, AA, LA, UA, RG & Global pass FFPs only) being offered from 1 August-30 September for stays at:

Argentina
Hilton Buenos Aires

Brazil
Hilton Belém
Hilton São Paulo Morumbi
Hilton São Paulo

Colombia
Hilton Cartagena

Ecuador
Hilton Colón Guayaquil
Hilton Colón Quito

Venezuela
Hilton Barquisimeto
Hilton Caracas

Terms & Conditions: Offer is subject to availability. You must be an HHonors member to Double Dip. Other restrictions may apply. You must request Plan Code 5H to receive this Double Miles offer. Hilton HHonors membership, earning of Points & Miles and redemption of points are subject to HHonors Terms and Conditions. ©2003 Hilton HHonors Worldwide.

Like many of these promos this may not be such a great deal.
Checked the rates for the dates during my upcoming end of Sept stay and found that the listed rate code gave rates of $130.00 as compared to $100.00 for the "weekend rate" for a Fri or Sat check-in or the 21 day advance non-refundable rate. $30 is a lot to pay for 500 more miles( plus 450 more HH points).
mike