How do you think, how many really stupid moves you must to do to win tonrnament with 1000 players or near it? Or you can play without high risk moves?
How many stupid moves? What are you suggesting, that you need to make mistakes and then suckout to win a tournament? That's just not right. Yes, it's true that some luck is involved in surviving a large field MTT, but that doesn't mean you need to play like a donk. The answer to your question is ZERO stupid moves. We make our decisions based on the information we have at the time, and on our experience under similar conditions. Poker is a game of incomplete information and often we find that our read of a situation is wrong, but we win anyway. Our opponent will often throw a hissy and call us bad names, but that doesn't mean we made a mistake or that our move was "really stupid".
Let me give an example. You've played solid poker for 5 hours and now you're HU with 15bb vs a laggy player who open shoves all-in. You have AQ and call (of course). You're opponent shows AK and you river a three outer to take it down. You feel a tinge of guilt until your opponent comments on your IQ an maybe tosses in something about your mother. Was your read wrong? Yes. Did you make a mistake? Absolutely not. In a 5 hour tournament you might see 400 hands and have 10 tough decisions, you're bound to be wrong about at least one of them.
The great thing about poker is that EVERYONE has a chance of winning, even bad players, that's why they keep coming back.The difference between the good ones and the bad ones is that the good ones have a better than random chance of winning and the bad ones less. Every bad play you make diminishes your chances of going deep, every good one improves them.