Business seldom fail for a single reason, but poor code quality can be a major contributor to failure.

Do you need to pay 20 programmers rather than 10?

Do you have a higher customer turnover rate because they encounter too many bugs and lose trust in the system?

Do you lose out on sales because you can't close the feature gaps with your competitors?

Are you unable to respond to customer support requests in a timely fashion because there are too many, or fixing the problems is really hard?