OK, here are some of my responses to your comments (I'm glad I can spark a good debate.)
Hard to see taking the gamble with 6-4 os. Now ... if you had some live cards you might take the chance.
If you hold 64 off, almost every time these cards will be live. The only situation where you might not have live cards is if your opponent has A4, A6, 66, or 44.
Ok, if you want to win a tournament, you have to accumulate chips however you can get them. If you make this call here, 98% of the time you are an underdog (unless of course he has 22 or 33). However, just because you are an underdog DOES NOT mean you should fold. Let me explain this topic that seems to puzzle almost everyone on this board.
If you win this pot your stack will be over 30K. If you lose, it will be at 20,925, still significantly above the average stack.
When it is folded around to you, the pot is 6475 (BB+SB+9 antes+ his 4000 chips), it is 2800 for you to call.
You are getting 2.31:1 odds to call here (6475 in pot / 2800 to call).
Even if your opponent has AK, you are only a 1.9:1 underdog (~35% to win).
You are getting the correct odds to call here. It is situations like these that too many players pass up. If your arguement is that you can save your chips for later you are missing the point. You are actually losing yourself potential chips here by folding. If you fold your stack is down to 23,750. Lets say the next hand you go all-in and double up. You only double to ~49K (with blinds). If you call and win the pot with 64off before hand you would double to around 61K. This is a BIG difference (12K, which is HUGE at this point in the tournament). It seems like no one else here understands the importance of putting your chips into the pot when you are getting the correct odds to do so in a crucial stage of the tournament. Calling in spots like this is what can seperate you from someone who every once in a while squeaks into the money, or someone who goes deep into many tournaments.
By folding here you are passing up a chance to accumulate more chips without taking a big hit to your stack.