The answer is a resounding YES.
If you were a business, you would need to understand what your revenue drivers are, and how much they each cost. As a charity, your donors will ask the very same questions of you, except they're measuring impact, not dollars.
This post will demonstrate (in 400 words or less!), why and how to measure your organization's revenue pillar Return on Investment (ROI). You'll be able to calculate it easily, without having your finance team contorted into pretzel shapes.