There are plenty of reasons why one would want to emulate it. For many/most people it is the only affordable way to run OS4. Personally I would at least be able to compile and test the OS4 versions of my software rather than samo79 always having to do it for me.
In fact frankly it is harder to understand why one would rather spend thousands on custom hardware. Only speed and compatibility. I think the important thing for the survival/success of OS4 is to get lots of people to run OS4. How many semi-generic PPC boxes are sold is less important.
