Dolla, of course, your comparing it to:
Blue Dragon's 43k first day (88k first week)
Dead or Alive Xtreme 2 33k first day (45k first week)
Dead or Alive 4 unknown first day (I assume 35-40k first day)(65k first week)
Consider the userbase: nearly 10% of every X360 owner bought a copy of Trusty Bell on it's first day. That'd be like North American 360 owners buying 600,000 copies of Forza 2 in one day.
TB should get, at absolute minimum, 45k, but since TB seems to be a pretty well-balanced RPG, it should get 57.5-62.5k inline with Blue Dragon.
Back from the dead, I'm afraid.