I mentioned this in another comment, but the presence of interchangeable clones created a form of distributed long term support for business software. This was

I mentioned this in another comment, but the presence of interchangeable clones created a form of distributed long term support for business software. This was the killer feature that propelled business investment. Companies invest a lot in tailoring off the shelf software and custom software. Knowing that you have the ability to switch to another vendor made the decision a no-brainer for most businesses.