No.
Sorry. It isn't.
For example, if you search for environmental organizations on Wikipedia, you'll find the following list:
Why should anyone make a major gift or plan a legacy gift for your organization?
What makes your nonprofit different?
Engagement!
That's what your answer should be.
If your organization engages and involves your supporters more often and better than the others, they will choose your organization over others again and again. It ain't rocket science!
Sometimes simplicity is the ultimate sophistication. 
