Extra sets of Cables to switch up system?

Hello Audio Fanatics! 
 

Over the last three years, I’ve put together two systems in my house.  Both give me great pleasure, with each system having its distinct sonic signature. 
 

I was wondering how many of you keep extra sets of cables - 

mostly speaker or interconnects I would guess - to swap in occasionally for the sake of variety? I currently use Cardas and LessLoss speaker cables, which I’m delighted with. I do sometimes wonder if I might enjoy swapping in something with a different sonic signature for fun. 
 

Btw - I’d only buy used if/when something came up at a great price. Brands I’m curious about include Purist, Snake River and Black Cat. 
 

Anyone keep spare cables to swap in and out everyone six months or so?