Some countries have a tax incentive. The U.S. has a tax incentive for volunteering.
Our point as well is that talk about volunteering strictly in those terms is problematic to many volunteers, who find it off-putting when they think of the altruistic nature of why they came to volunteering.
So again if we're talking about recognizing volunteers with the assumption that it's not an incentive for people to volunteer or volunteer more, there are other mechanisms to recognize a volunteer contribution.