Or cost trade offs, not necessarily sub-par.

I can do fantastic siding and tile work personally and would be exceptionally hesitant to pay someone to do it. My FIL has done concrete work for 30 years, why would I pay someone to do it?

I own a single family home with a kitchen that needs work. I can choose laminate countertops to save money, even though that is lower quality than is common to the neighborhood.