Just wondering, why is .22lr subsonic more expensive than .22lr supersonic?

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I have to amend my statement.  I finally found the article I had read.

It spoke of cataloged items at Midway USA.  50 Subsonic loads versus 49 Supersonic.  So, not more than half sold, but more than half the cataloged ammo.

Browsing the list, it is notable that most "standard" velocity 22LR ammo is rated as subsonic.  All the Eley I have is so rated.