This email template have a very high sucess rate in getting application fee waiver for undergraduate applications. Although, there is no guarantee that it will work for all universities, but it will work atleast very well for Ivy Leagues. 
With this one email template with just one payment, you can potentially send emails to all the prospective colleges in USA asking application fee waiver and potentally save hundreds of dollars in application fee.
 
Note: The success rate of this template email is higher for UG applicants. For graduate applicants, the success rate is lower, but not zero.