Heh.
I suppose it doesn't matter at Wolf Pack's level what you run though, as long as it's run with some semblance of competence and isn't something stupid like 20/25 faeries *ahem*.
But even in decent war kingdoms, faeries attacking is very doable. There are times were it works though, especially later in war when returns time are broken up. If you know that the offenses that can break you are several hours out and not aligned in sequential order, it's harder for people to complete chains against a high defense province even if they have the offense to break. Using an attack to drop the nw of an attacker that could be a threat to your top might be worth exposing a province to the possibility of being topfed, if that topfeeding is going to screw a kingdom's attacking core.

It's a lot harder to Faery to get the necessary opa to break, but huge offenses can die off pretty fast. If you only need 50 dpa to prevent a clean break and are sitting on 100 dpa mod, you can pull 5 beastmasters, draft up 1 soldier per acre, and somehow obtain ponies to mount part or all of that. That will give 28 raw opa to work with, which is enough to tap a fair number of provinces.

While you may say "that's not really an attacker" - Halfling is essentially in the same position of being forced to hold armies for a long time until they can safely break targets, but they have worse nw, a gains penalty, and magic vulnerability working against them. At best, they're not able to utilize the extra acres as well, because they don't have ops defense worth a damn. And because of that vulnerability, the only safeguard against Halfer is to run enough that they can't be destroyed or contained with magic, which means running a lot of a province that can only do thievery. As a static superthief, Faery is better simply for their defense, spellbook, and peacetime economy, even if their wpa isn't particularly great.