As with so many things, the answer is "it depends". How long will your code be around before it's scrapped or fully rewritten? Who will be maintaining and exten

As with so many things, the answer is "it depends". How long will your code be around before it's scrapped or fully rewritten? Who will be maintaining and extending it? How much money will you have on hand to hire people to work on it? If it fails, what's at risk? Lives? Nest eggs? Blog posts?