If repairing usually cost 0.1% then everyone would do it.

The reason almost nobody in first-world countries is getting their microwave repaired is because it often costs more than buying a new one. This is because the new unit is manufactured overseas in a place with cheap labor, but the existing unit has to be repaired locally with expensive labor.

Of course people aren't emigrating because they don't want to repair things. But they are often emigrating because they want to live in a place with high labor costs (i.e. high salaries), or for other reasons that are very strongly correlated with high labor costs.