Should I Have a Computer Just for Hacking?

Basically, I'm having a new computer, because of work related reasons. But my older computer is still pretty good (16 gb of memory, intel® Core™ i7 4700HQ Processor) and I'm interested in white hat hacking, among other stuff. Should I use my old computer just for hacking? What are the advantages of having a computer just for hacking? For instance, I have a VPN service on the old computer - if, by any reason, someone is able to hack or stole my old computer will they be able to reach my new computer (assuming that this last does not have VPN)? What are the advantages and disadvantages?