[Ross]

At this point you have'nt got enougth chips to call. When you bet you need to move-in and apply maximum pressure to the pot. If it is a tight passive a big grandstand move with 89 will work but it is preflop that you have the maximum fold equity the blinds must have a hand to call and the limpers have shown no strength. Whereas making the move on the flop gives 4 players the opportunity to catch enough of a hand to call.

regards