The value is being able to run programs that can only run in Mac OS X. There are plenty of reasons why you might want to do this. You might want to build some

The value is being able to run programs that can only run in Mac OS X. There are plenty of reasons why you might want to do this. You might want to build some custom processing job that relies on something built on top of OS X for example. There are at least two YC companies that have done this.