This is exactly the reason why companies aren't just going to vibe-code their own software. It's more expensive to maintain than it is just to pay for it outright
Depends heavily on the software cost and how far from core competency it is.
If the company already has a developer team and the software is an expensive domain-specific CRUD app for internal use without significant compliance or risk factors - sure, go DIY.
If the company does not employ any devs, or if the core logic of the software is a business secret of the vendor, or it is customer facing, or there are significant compliance / risk factors - you are better off paying for it.
Unless the cost is astronomical, or the company is motivated also by anger at rent-seeking MBA f*ckers at the vendor.
