"Call up Signature or Avitat at White Plains, tell them you're arriving on whatever date and make up a tail number, have them book you a room at the one of the hotels that they have agreements with. You can usually save a few bucks."
Yes, very ethical. Cheating is a great way to go through life, and certainly rewarding- knowing that you can save a few bucks, but only by misrepresenting yourself.
Why not be truthful? Tell them you trust their judgement and local knowledge, and would like them [FBO] to book a hotel for you. Maybe you'll get the good rate without the deception.
Does not anyone have sense of pride or morality anymore???