When you do recruit-a-friend, if your friend pays for 2 months of the game, you get a very special mount. And while it's nice because it's free (and rare), I've since found that it's not entirely Birdfall's style. So the official story is that Birdfall's rambunctious sister, Latoria, met a peddler at Darkmoon Faire and got a really great deal.
Birdfall's job, for those of you who don't know, is basic reconnaissance for SI:7. She goes to places, checks them out, and returns with a report. But one of the keys is keeping a low profile. >_>