But couldn't they improve the signal to noise ratio by showing contextually relevant ads e.g. showing rice cooker cookbooks after purchasing a rice cooker? Woul

But couldn't they improve the signal to noise ratio by showing contextually relevant ads e.g. showing rice cooker cookbooks after purchasing a rice cooker? Wouldn't this lift ad click through rate? This is truly baffling expected behavior, who would ever buy a second rice cooker after having searched Amazon for rice cooker and compared a few top models already? I'd love to see some studies or data proving otherwise...