Not Waiting for the Big Blind

Sklansky wrote that mathematically, not waiting for the big blind to come around is not disadvantageous.
The problem is there are many instances where if say.... two players join the table wiithout waiting for the blinds, the table suddenly becomes aggressive. The addition of two big blind sized addtitions to the pot does not change the pot size much. And the addition of two more players should make everyone play tighter, more players more tight and less players play more cards or loose. All this is a strange occurance on the micro limit tables.