[SittingBull]

live medium pairs and live draws on 3rd if the field becomes "short", your stack will be diminished quite rapidly if someone is almost ALWAYS completing the bet on 3rd.
So if U sit back and wait for preminum hands to play,U will be given up too much if U do not play against a small field on 4th with a marginal hand on 3rd or with a draw.
I would play more liberally on 3rd and 4th but be prepared to fold on the more expensive Str. with no improvement.
However,I do expect large "swings" in my stack if I do decide to play this way.
But all I need is a big buy-in and a good "psychological Bankroll" to successfully compete over time with a small risk of going broke.
I realize that players completing their bets on 3rd will do so with a wide variety of legitimate hands. Their objective is to "knock out" players who might connect with their drawing hands or other better hands.
They do not want my "limping in" cheaply for a 4th or 5th card without punishing me for trying to improve on 4th or 5th.
But if I consistently fold these marginal or 3rd Str. drawing hands,the ante will"eat up" my stack.
I would bring enough "ammunition" to go to war!
I would EXPECT hugh losing sessions but MORE hugh WINNING ONES.
Another reason for taking a more liberal stand on 3rd---players who notice my folding often on 3rd will tend to run all over me.
And if I play according to your strategy,I WILL be folding a lot of hands on 3rd,my stack will be depleting, players will tend to run all over me,AND I WILL RECEIVE LITTLE OR NO ACTION when I DO enter pots and continue playing beyond 3rd.
Because of all of the above reasons,it is more advisable to play more liberally on the early rounds.
Of course,if one can find a table where the players are NOT frequently completing the betting on 3rd,then his SD would be a lot smaller--however,his profits would be smaller too--UNLESS he is in a loose passive game or if the players are "tied on" to their hands when he completes his potentially winning drawing hands. In other words,if there is implied odds,then his profis will be substantial--but NOT in a TIGHT-Passive game.
Happy pokewring,
Sitting Bull