Madonna's $19 Million Dollar Adoption

Madonna's adoption of Malawian baby Mercy cost the celebrity $19 million, reports the San Francisco Examiner:
"The allusion is that without this kind of financial good will contribution, Madonna may not have been awarded the adoption of 3 year old Mercy because she did not comply with the country's adoption laws."
While the cause is noble, why are so many wealthy Americans adopting poor children from other countries when there is an abundance of poor children that need to be adopted here in the US? What do you think?
For more information:
http://www.examiner.com/x-7371-LA-Blended-Families-Examiner~y2009m6d14-M...
Adoption.org