The reason for existence of "why would a consumer ever buy one of these at retail" cards is simple: they are for OEMs, and a retail launch with token or no marketing is nearly free money.
e.g. OEM wants an Nvidia GPU to offer as an option in their dropndown system configurator alongside an AMD GPU. An AMD GPU (regardless of efficacy) is available for $x, so OEM wants an Nvidia GPU for $x, and go to Nvidia saying "we want a GPU for $x, we don't care about its performance, and we intend to buy 100,000 per month for the next 10 months". Nvidia thinks that x million dollars is x million dollars, and worth pumping out a tiny chip design - based on an existing chip design (using lowest binned almost-reject dies) slapped onto a lowest-possible-cost PCIe board - for a contractually guaranteed revenue stream and continued mindshare from that OEMs customers.