> No code requires marble countertops. Yet they get installed because buyers want them. "Follow the money" always works. Builders want (reasonably enough) to

> No code requires marble countertops. Yet they get installed because buyers want them. "Follow the money" always works. Builders want (reasonably enough) to increase profit. Marble countertops add a few thousand in cost but now you can sell these as luxury units for tens of thousands more! So it's profitable, so it happens. Building parking space instead of additional units is not profitable, so it won't happen unless required.