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Many people have been burnt by bad deals and don't want it to happen again. The best way to give a customer peace of mind and confidence in you and your product is to offer them a full product replacement. Or better still, an unconditional money back guarantee if they are not completely happy with their purchase.
All credible businesses will do this, but when you SPELL IT OUT CLEARLY, it gives the customer peace of mind and confidence knowing that they won't get ripped off. This is "risk free" buying.