eBay hosts more than 12.5 million auctions per day in more than 1000 categories across 28 global markets and attracts more than 43 million unique visitors per month. This paper explores online auction users problematic behaviors that could potentially lead to an addiction. Specifically, we examine the following research questions: what consumer behaviors could be construed as problematic and potentially addictive; do these behaviors generally reflect the core components of addiction; and what are the implications for online auction retailers, managers, and society? Using qualitative methods, the authors identify four key themes that capture problematic behaviors that could lead to online auction addiction. These themes include psychological distress; habitual usage; negative consequences; and dependence, withdrawal and self-regulation.