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.