No, really. In fact, when you go live, your software shouldn’t be “done.” If it is, you’ve done something wrong. You see, in the history of software, there’s never been such a thing as a piece of software that launched without bugs. Think of your favorite, most used platforms. Gmail. Facebook. Salesforce. All are brimming with bugs. Every day a user writes into their contact forms about a bug they discovered, and while a lot of them are PEBKAC errors, a lot of them are legitimate bugs. And the ticket tracker logs them, someone triages them, and, eventually, most of them will be corrected.
In the world of software consulting, it can be virtually impossible to determine what the fair market value for software development is. Nobody estimates work according to the same parameters: some firms have differing rates for differing services, some have offshore development services, some won’t provide a meaningful estimate at all (and for good reason).