One of the toughest things I struggled with while transitioning from a 
    larval junior developer to a senior tech lead to a project manager was the 
    fact that (at least in the context of a for-profit business) not all bugs 
    need to be fixed, even the ones you personally think are really really 
    bad. The goal is to make money, not necessarily by producing the most 
    perfect software.

On the other hand, you have to remember the that impact = risk x loss. And developers and managers are notoriously bad at evaluating the risk posed by a bug. It does no good for software to make $10 millon dollars a year for 5 years and then make a $100 millon dollar loss in the sixth, because of a catastrophic bug that no one prioritized fixing because, "It's been 5 years and no one's run into this bug yet."