The studies and measurements we're discussing here are focused solely on the sound quality of the loudspeaker. That is of course not the only criteria for buying loudspeakers. Other factors include price, size, aesthetics, reliability, marketing, brand, availability, connectivity, not to mention the many psychological biases that come on top of that. It's not
that surprising that sound quality correlates poorly with sales volume, as it's just one factor among many others. Keep in mind many people see loudspeakers as living room furniture that just happens to make sound too.
By the way, before wasting your time here, I suggest you read
this book. The questions you've been asking have been debunked in this forum (and said book) many times already. The arguments you're making are basically
PRATTs at this point.