Onur Cobanli explains:
Good design helps convert business leads into customers; good design gives several implicit messages; 1) it implies gently and subconsciously that the product is of good quality 2) it implies that the product is easy to use 3) it implies that the product is trendy 4) it has a secret promise of happiness and satisfaction. These all are communicated to buyers without words being said; good design auto-communicates and explains itself; it asks people to buy itself.