Why exactly?
That money was donated to help find a little girl, nothing else.
How do you know that? Actually, if you go to the CashCowMaddie homepage and click on the donate button, it gives the following exemption clause before you confirm:
All money donated to Leaving No Stone Unturned will go into the tireless efforts for finding Madeleine...... However, in the unlikely event that we have to deal with unforeseen costs such as emergency travel, administration or legal fees, the fund will help cater for these costs also.
The above may or may not be true.