Why? The Home and Pro versions are almost identical, except for a small handful of few features that home users would never miss and limits that would never bother a home user*. It's really just a way for Microsoft to extract more money out of businesses for Windows while providing an almost identical product. It's actually pretty clever (or evil, depending on your perspective) if you think about it.
*I realize that Windows 7 Home has a 16GB limit which is pretty easy to run up against nowadays, but it's 5 years old now and Windows 8.1 Home has a 128GB limit which would be hard to hit with "consumer level" hardware.