This notion of consumers selling their own data just won’t go away. This newsletter has covered several vendors and our sister blog Customer Experience Matrix recently took a deeper look. Now here’s a MarTech piece announcing yet another product, from SRAX, and casually mentioning two others, Datum and Data Wallet. As the Customer Experience Matrix piece shows, business models vary considerably and many of these are more about building advertising audiences than paying people for their data. Seller beware.