Yogurtland offered free Yogurt a few days ago.

Here is a wonderful economic lesson! Yogurtland offered free yogurt to the public today. Well, what happened? People lined around the block to get some free yogurt. Considering that the yogurt probably costs $3 or $4, I have to ask, Why is it worth an hour of your time to wait for free yogurt? If you wouldn't work for $4 an hour, why would you wait an hour for free yogurt?