#2: Improves your ability to get grants
Because your grant writing skills will be honed by reviewing grants, you should start to secure more grants. This is because you know how grants are reviewed and you understand the experience that grant reviewers go through (i.e. quick, intense reviewing processes).
#3: Increases professional development
You can put your grant reviewing experience on your resume or on your website!
For grant writers who work in a nonprofit, this is helpful to showcase your learning. For freelance grant writers and nonprofit consultants, this is especially helpful to showcase when you are writing future grants for those programs you have reviewed.
#4: Increases your income
You will get a small stipend when you are a federal grant reviewer. On average, you will get paid about $125 per grant reviewed and review about 10 grants. Therefore, you average around a grand for being a grant reviewer!
This changes based on how many grants are submitted, but this is the average.