Customer acquisition costs are soaring, prompting some ASX-listed ecom players to lift marketing spend, either massively increasing performance investment (Kogan), or pivoting toward brand in a bid to reduce reliance on paid search and social (Temple & Webster). More elementally, many pureplays are pushing hard into physical stores as ecom economics tighten. Former investment banker turned ecom entrepreneur Carla Penn-Kahn says some are nailing it – citing the likes of LSKD, Mecca and Baby Bunting. But she warns many are woefully undervaluing owned media, while others are falling into the discount trap with loyalty schemes. Across the piste she sees clear and present danger of more Mosaic Brands-style implosions due to a foundation-level misunderstanding of the customer. She also thinks what constitutes a lapsed customer constitutes a wholesale rethink – especially for those handing over performance marketing budgets to performance black boxes. Meanwhile, Accenture Song Head of Tech and Ecosystems, Josh Lamont, reckons shopper promiscuity is driving retailers to grapple with two marketing fundamentals.