IDENTITY, I have been betting with WSEX for years. I have seen Steve the owner bend over backwards for the player. He would not have kept the money. You are assuming that Steve is a crook. WSEX is an honorable sportsbook with integrity.
Most of my book accounts have my old address and old phone number but i know the person who is at both so i just leave it like that so i dont get assholes from betmega or something trying to get me to top up
Identity-
Great points (and irony since your handle is 'identity').
What if the sportsbook entered a player's email address into the database incorrectly? You would be suprised by how many different ways a customer service clerk spells "hotmail". Often players give only one number (home, work or cell) and don't want calls going to their wives or offices.
I don't think that many (any) of the sportbook programs display player contact information for the player to confirm his data. (This may be a security precaution.)