All kudos to you if you can make it work. OTOH, in my experience people don't value things they get for free. ESPECIALLY in the area of design, where committees of self-styled experts think they have license to tinker endlessly with the work that you agonized and sweated over, all at no cost to themselves or their organization. If you discourage the tinkering by charging for revisions, you're really doing them a favor by getting them to focus on things that are actually productive and in their areas of expertise.
(When I started my first job in advertising almost 40 years ago, my boss, a very senior creative director, would not accept a client unless they would identify ONE person who had final approval over the work. No committees.)