Change your ads regularly. Your prospects could get bored seeing the same ad all the time. Statistics show people usually see the same ad 7 times before they actually buy. Just change them enough to keep them from being over-exposed. For example, if your ad said. "FREE Killer Marketing E-book!", you could change it later on to "FREE Sizzling MarketingE-book!
Lower the chances of negative word-of-mouth marketing. You'll always have customers who are dissatisfied. Try to please them as much as possible. You could give them a refund, discount, a free product, a coupon, a rebate, a compliment, etc. Just be polite and stay calm if they are angry or frustrated with your business.
Give people a deadline to order. Tell people if they order by Sept.15, 2002, they will get a discount or free bonuses. This will create an urgency so they don't put off buying...