I added some eval statements to my gnus-posting-styles to set my pgg
user id (pgg-gpg-user-id) for work and play for occasional message
signing.

However, pgg is continually only picking up my default ID.

The documentation says that

,----
| -- Variable: pgg-gpg-user-id
| User ID of the GnuPG default identity. It defaults to `nil'.
| This overrides `pgg-default-user-id'. You can customize this
| variable.