The purpose of this study is to explore the luxury counterfeits buyers purchase motivations and understand their behaviors by analyzing the needs for the luxury counterfeiting goods. The results indicated that three unfulfilled needs for the buyers: social needs, personal needs and functional needs, lead to differences of the motivations (eight motivations are defined).The diversity of motivations drives the buyers to have two mains purchase behaviors: loyal luxury counterfeits purchasers and occasional purchasers. A theoretical model is proposed for the further quantitative study in an international background. On the contrary to the common sense that the counterfeiting buyers are not the clients of luxury goods and will not devalue the original luxury brands, the conclusions showed that the counterfeit buying behaviors are quiet different and have strong negative effects to the luxury brands. The studies were conducted in three international zones, Europe, Japan and China, where the main luxury products markets are and counterfeit activities are active.