topr8 - 12:54 pm on Dec 1, 2010 (gmt 0)
many people can't calculate their actual costs.
many people don't even know what their margins are.
many people wouldn't have a realistic plan for what they are hoping to achieve from coupons (or indeed any other promotion)
the advice of the salesman and the numbers/stats he gives you should always be considered in conjunction with independent data!
just because everyone else is doing something doesn't make it right for you