A 75M roll of #12/2 NMD90 wire is $262.00 I can only imagine what a custom roll of Cryo treated wire would cost.
I guess it's all relative as I know some who spend many thousands more on a component whose sonic benefits are less than a handful of simple electrical objects cryo-treated via the full immersion method.
Back in 2007, my cryo'ing vendor in the mid-west (I'm west coast) purchased two rolls of 12g and 14g at 250ft per roll at his local hardware store and then double-cryo'ed and shipped to me for a total cost of about $600. Chump change really considering what it might bring to the mix.
Especially since it has to do with improving general electric current / input signal flow - which is really the only thing we care about regarding our playback systems, right? It's all 100% electric current / input signal flow and the quality thereof, isn't it? All the way from the power plant up to and including the speakers 'voice coils? Ok, 95% electrical if your source is analog.
IOW, every time somebody spends resources on genuine electrical improvements of any sort, all the angels of heaven rejoice... I mean, some might call call that performing proper due diligence.