You are all great! :-)
If we ignore that it's audio grade, or let me refrase that. When I was looking trough components, did I only stop at the expensive cap, because it's high price.
I had a list of caps and most of them were below 2$ and then jumped out this 2 x price cap. I thought that it had to be a very expensive brand but found out that it's almost only that single 220uF cap that did cost so much.
I could see that it was an outlier, but could not find any reason for it. 220uF is, as far I know, not that uncommon, so it could not be because some special production, like a 261.5uF cap would be.
In short, that they are audio, do not differ from any of the caps in that series, there construction can't be that different and mass production should also be common for them. So why 2 x price for ½ capacity? :-)