“…Second, this study is the first to apply customer value theory to the OPK context to understand consumers' OPK purchase intention. Previous studies used social exchange theory [4,14], social support theory [10], expectation confirmation theory [78], information adoption model [10,13], social capital theory [5,79], motivation theory [5,7], and self-discrepancy theory [63] from a personality traits perspective [80] to investigate why users use knowledge platforms. In terms of paid knowledge, little research examined knowledge as a commodity, and the reasons why consumers purchase OPK remain unclear.…”