Amiga doesn't do anything that can't be done faster, easier and better on other platforms at the moment. So no, there are no reasons to persist.
I love the classic amiga and I still use it (professionally if you can believe that) every day. But all this 0S4 nonsense is a joke. With Windows, OSX, Linux, NetBSD and many others available to you for the x86, plus the fact that the hardware is available pretty much anywhere for very few dollars, why bother?
And also, the company is run by people who couldn't deliver a toast on time if you cooked the bread for them.
Top 5 reasons to get OS4:
1- You are tech-oriented and would like to fiddle with a new toy and contribute little snippets of code to try to bring the OS up to par with the rest.
2- errr.. that's it.
As much as I would like to use a modern Amiga... there is none in existence. The latest incarnation of the OS is designed to run on dated hardware, that costs an arm and a leg to buy because there is so little demand for it. I love the OS structure, and how simple and efficient it is for the task it is able to perform, but I just can't see it cope with the increasing complexity of modern computer usage.