I'm subscribed in Thunderbird to subforum feeds I can possibly make money from.
These feeds will work with THunderbird but not with other readers / parsers...?
They don't. I didn't see the "action=.xml is disabled due to slowness. If you use this, write a post in Meta explaining your usage." until I poked around in Meta looking for an explanation why Thunderbird had blank feeds. My post above is explaining my usage.