There are a few things pay for when you buy proprietary software licenses:

• Product support
• Quality control (E.g. any procedure that makes it into SAS is rigorously QC'd, whereas anyone can publish a package to PyPI and the only way to tell if it does what it says is to do the QC yourself.)
• A license to profit off what you do with the software

Proprietary software isn't for everyone, but it has its place.