Threadripper is a cpu that AMD has released to be one of the most powerful Cpu's out there... But is it worth the heavy price point?
There are two things to consider, your price point, and what u want to use it for... if you just want to game i would suggest picking the lower end AMD RYZEN CPU's ( 1700, 1500 ) because it is a lot cheaper, and can play basically every game out there if u have the right Gpu.
But if you need the CPU for more intensive activity for running a server for example, those extra cores and threads could be the better choice for you if you are willing to pay that heavy price point ($1400)
In the end its all about what your gonna be using it for... in my opinion for games its not necessary, but for more intensive tasks it could help a lot if you are willing to spend the money for it.