It's not just about time you can save right now, it is also about risk.
Depending on a 3rd party, proprietary solution may be considered a form of technical debt. If (or when) the 3rd party raises their prices, goes out of business or does something else unhelpful to your business, you'll have to replace them.
Depending on what it is, that kind of work can be far more costly late in the game than it is at the beginning.
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It's not just about time you can save right now, it is also about risk.
Depending on a 3rd party, proprietary solution may be considered a form of technical debt. If (or when) the 3rd party raises their prices, goes out of business or does something else unhelpful to your business, you'll have to replace them.
Depending on what it is, that kind of work can be far more costly late in the game than it is at the beginning.