One request was: "Excuse me. I only have five pages. May I use the Xerox machine?" Another request was phrased: "Excuse me. I only have five pages. May I use the Xerox machine because I'm in a rush?" In a third situation, the participant said, "Excuse me, I have five pages. May I use the Xerox machine because I have to make some copies?" There was no reason given for the need …just the words "because".
Request #1 was granted 60% of the time. Request #2, the request coupled with a reason, was successful 94% of the time. But here's the clincher: Believe it or not (and you'd better!): 93% of the people said yes simply due to the word 'BECAUSE'!
It didn't matter that there was no reason given for the request. Just using the magic word "because" triggered the desired response -- allowing the test participant to cut in line.
"Because" will have the same effect on your desired response -- it will make your customers buy, buy, and then buy some more!