When I worked in a grocery store we would run ads 2 for $1.00 and people would flock to buy it...when the regular price was .48 cents each...but they stock up at 2 for a $1.00. Our local Vons runs a lot of 10 for $10.00 sales and one of the products is regular .79 cents but I have watched people load 10 into their cart and think they are getting a deal when they don't realize they are paying $10 for something that would normally cost them $7.90 for the same 10 products when not on sale. Interesting and yet a little sad.