In the two-three blind structure, the small blind has already invested 2/3 of a big blind bet into the pot. Failing a previous raise, the small blind generally completes the bet in the hope of seeing the flop. It is not really advisable for the player on the small blind to fold a hand. His 2/3rd's forced contribution dictates that he should normally play for the flop.
Example:
If the big blind is set at $3, and another player before you has already flat called, then it will only cost you another $1 to call. You have already invested $2 into the pot. By adding $1, you will still be involved in the game. It will cost $1 to see the flop with $9 the pot. This gives you 9/1 odds, and as you have probably already worked out by now, the entire look of a holdem game can change dramatically once the flop appears.
Your best course of action would generally be to call. If you are playing against an ultra aggressive player who tends to raise on his big blind, you need to consider the fact that another player might be banking on his raise to reraise, costing you 3 big bests to see the flop, but in normal circumstances, the play would be an automatic call.
Two-four blind structure suits players who play a tight game. Due to the bigger jump from the small blind to the big blind, this structure is likely more suitable to players who prefer to hold back for a strong preflop hand. If they played the two-three blind structure, they would find themselves throwing away too many hands preflop. If you are more of a passive player, seek limit holdem games with the two-four blind structure.
