Shortcode stripper is a free addon to Post Pay Counter which allows you to exclude text included in shortcodes when computing words payment.
The addon works with both enclosing and self-closing shortcodes. Indeed, it works with any shortcode that works in WordPress. This is especially useful when you have custom shortcodes used to quote content, or to display content that was not written by authors and for which they should not be paid for.
Shortcodes to be removed when counting words should be put comma-separated on line 17 of the only file that makes the plugin up. Make sure you leave everything else untouched (starting and trailing quotes, semicolon…).
For example, this way the shortcodes gallery and quoted_text will be removed with all their content:
$ppc_shortcodes_to_strip = "gallery, quoted_text";
If you have trouble setting it up, or for any issues, just head over to the support forum.