My wife owns an after school tutoring center. We sponsor the local elementary school - and one time they had a silent auction fundraiser. We were asked if we can donate anything. We said sure...we gave them three vouchers, worth ~$150 each of services. We were expecting 3 lucky families.

At the end, the coordinator herself won (or supposedly won?) all 3 vouchers and showed up with her kid. For the next silent auction we ensured to put 1 voucher per family. The shock on her face when she showed up again, with 3 vouchers in hand and my wife told her to read the fine print.

From the HN comments it looks like - we were silly for trying to promote something in good faith and we deserved to have been abused. Jokes on them because reality is small businesses stop doing fun things for the community and it becomes strictly business.