You do if you're in a rush to make a headline-breaking deadline, and if it's a significant number of rejects you hire someone to extract what they can off the board to put in the scrap bin.

Hypothetically if it cost them $2kUSD overhead per unit, and they sold 100,000 units expecting a 5% reject rate then they'd have 110,000 units of inventory (more in reality). Considering they're making 50% (roughly) per unit, a 1% loss per unit isn't a big deal.