Cause Marketing

Why are there so many rewards programs for spending, but not for volunteering?        

Reward Volunteers celebrates volunteers and non-profits with positive social support, motivational tracking, and win-win incentives. The app’s sponsors provide cash and prizes, and every time someone logs their hours with Reward Volunteers, they accrue chances to win -- in equal proportion for themselves and the organizations they serve. It's free and you can volunteer on behalf of any US non-profit.