If an organization pursues goals I find important, I want to make sure that it has a sound financial plan for paying for all of its inputs, including labor. I don't want it to pay below market rates, because this will increase attrition. Volunteerism does not scale.
The organization should pay market rates for their labor inputs, and welcome donations from employees who are able and willing to doing so.
The organization should pay market rates for their labor inputs, and welcome donations from employees who are able and willing to doing so.