People do so much hacking and such on things like the Billy bookcase. They'd be just better off getting the plywood and building the carcass themselves, and it'd be 10x more durable than the ikea cardboard version. I've watched several videos of people spending multiple weekends turning them into built-ins....and then at the end of the day, it's still a cheap ikea, cardboard shelf, that will bow under weight, etc....
I wonder about the psychology. Is it like chain restaurants - the brand name and decades of experience guarantees a floor on quality, with people estimating their DIY as having a much lower floor. Plus the laziness of starting from scratch
Then when you start it's obvious sunk cost fallacy
