> Even if this thing is 30% more expensive than a non-repairable toaster, I bet many consumers would pick the cheaper one, despite it probably not being the long term financially optimal decision.

Toasters are so cheap that I can't imagine repairing them could be cost effective (ie "financially optimal") unless you assign no value to your time. A new, good-enough toaster costs in the ballpark of $30. I love taking things apart and fixing them, but if the repair involves figuring out the part I have to order or soldering anything, it will take far more than $30 of my time.

This kind of project is for people who love to tinker. The economics do not make sense.