Why are people so cheap?

I work fast food. And someone came through the drive through an ordered a few things. When he came to pay he handed me a coupon that would have given him his food half off. But the coupon didn't apply to what he ordered. So instead of paying $3.00 he would have paid $7.00. But instead he just said "Oh... show more I work fast food. And someone came through the drive through an ordered a few things. When he came to pay he handed me a coupon that would have given him his food half off. But the coupon didn't apply to what he ordered. So instead of paying $3.00 he would have paid $7.00. But instead he just said "Oh nevermind" and drove off. Why are people so cheap? It's 7 freaking dollars!
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