This is a discussion on Running out the cards after preflop all in. within the online poker forums, in the General Poker section; Does it serve a purpose to slowly run out the cards after players are already all in preflop?
We need to show the flop, then
In TV shows it is needed to make it more interesting for viewers. In the local casinos the only reason i see to do it is to be sure that everybody on the table have seen the cards and hand is played correctly. I have personally seen few cases where the dealer does not see correctly the outcome and for example pushes chips to one of the players at the end in split pot situation. In this case other players interfere and correct him/her so maybe this slow roll is to give time everybody to see the development.