Don't spend time, effort and money on things that do not bring business value. Any time I see a company with engineers building something they could buy off the shelf [and the thing they're building is not the product] I know their priorities are whack. I've worked for several companies that had more money than brains. They'd spend years, and millions of dollars in salaries, to build shit they could have bought and implemented in two months. And not only that, but multiple iterations of failing to build said thing, by multiple teams.

Just because a tractor is used for farming doesn't mean a farmer should build her own tractor.