The cost of fixing bugs is correlated with the value your software provides. If you write any software that not much people are using and relying on it (I mean, relying on it to do their job, manage their bank account, their customers...), then a bug on a production system will probably cost you a lot. The other side of that is that code where you don't need software engineering cannot be really relied on. Hacking will help you getting a prototype fast, but if you want to scale you need software engineering. Twitter (amongst others) learned it the hard way.
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The cost of fixing bugs is correlated with the value your software provides. If you write any software that not much people are using and relying on it (I mean, relying on it to do their job, manage their bank account, their customers...), then a bug on a production system will probably cost you a lot. The other side of that is that code where you don't need software engineering cannot be really relied on. Hacking will help you getting a prototype fast, but if you want to scale you need software engineering. Twitter (amongst others) learned it the hard way.