I remember Matt or Dorian saying they had already registered "ffxivah.com" (it redirects to "ffxivpro.com".) I'm sure it was done on the off-chance that if FFXIV did ever adopt an AH, it could be used. :p
Once a long long time ago FFXIAH was a site to check the AH. It has come a long way.. I like pro, its been a great site I have stuck with over many other forum posting. I say go PRO babeh!