Pacific Poker does count Demo players, and you are correct that you are supposed to see some kind of funner there.
However, Pacific Poker does not require a demo account before signing up for a Real Money account, so it may be the 4 players signed up immediately for a real money account.
I assume that the greater your audience and the broader your promotions, you will see a proper ration between demos and real money players.
Good luck
Shelly