No, you do not. The real key to audiophile level performance is the streamer. Then when you get to the level of performance you are looking for you can start tweaking interconnects, power cords, and maybe add a EtherRegen.. (~$600).
I run my system (see my ID) using a $69 wifi extender. My system achieved the highest level of performance equivalent to my really good vinyl end using just that. I have since added a EtherRegen and received a tiny increase in SQ. I think it is because I have a really good streamer which cashes the data and completely isolates the outgoing stream from the network.