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The difference is that demand for these units is significantly higher than the demand for the 21" Staggered Arachnid rims which cost 6-8 times as much. I think the prices will stay close to retail.
You can actually see in the picture that the cable is 24'. There is another Black HPWC on the other side of the post. You can see the cable on the ground in the background. Looks long enough to be more than 8', so must be 24'.
Wish I could see if any additional features come with this HPWC. That may get me to install one of the 2 I have coming instead of selling or giving them away.