Your goal in business is to profit and in doing this you need tactics to lure people in the community to patronise your products. It's not only tactic your main concern but also a strategy which is very effective that even a competitor cannot outsmart it. You have to make sure that it's effective or may turn destructive like for example giving daily sales to all items thus landslide sales happen forgetting that you make a mistake. It could be sales daily that start from 5 percent not 70 percent.