I disagree. Savings is a competitive advantage usually dropping your costs, time to market, and increasing profits, or efficiency, even if you don't reflect that on the books. Managers could ask employees to do more things as opposed to reducing the labor costs (layoffs), e.g.
Also since it's software, those savings typically compound. E.g: so I save tedium in accounting for $1M in the first year. It's so successful that you expand my efforts to other parts of your company. The next year you still have $1M + whatever I have added. Or $2M+ over the course of 2 years.
If you decide to go with a external package and pay a recurring licensing cost -- which is pretty common in the software industry, then you'd be paying maybe 10% of whatever you save per year. One software package we were looking at was $6M/annum. That's roughly 30 engineers being paid $200k for a year to come up with an alternative. We're using 5 engineers to do the same thing for less.
While it's hard to gauge true costs, paying my team $1M to save you $6M in recurring costs seems like a bargain, and something that's hard to argue against. In fact $2M might not be a bad number either depending upon how management sees it.