[avin01]

I haven’t used Odoo myself, but a few friends have at small NGOs, and from our discussions your concern seems real. It works fine if you stay close to out of the box. Once you need real customization, you start depending on the partner for every small change, and costs slowly creep up.

I agree with @magnumpowers. Without someone technical in-house, it can turn into a "managed software" pretty fast :)

If most users are volunteers and non technical, I’d be a bit cautious and compare simpler tools first.