"most games which are protected by SF3 will be cracked in 2-6 months"
With all respect my friend: discussed relase date is 3 weeks after the game appeared in shops. Why are you saying
"will be"?
"and some of them will never be cracked. "
I have never heard about uncracked software (including game), did you? Sometimes we can find a rare software which stay uncracked - not because of protection strength but specific type (engineering, architect, astro, etc.). Even if for some games cracks don't exist, you can mount MDF images and play this game without crack (like Toca2).
"the first 6-8 weeks after a game launch are important because in this time the big money is done..."
I thought the same... but in the past

Why that's wrong? Because the money from first 6-8 weeks are usually about 30% of whole incomings. Do you know what's the title in the first best 15 selling games in my country? Ravenshield 3 -
2 years old game. Look at Amazon or your local stores. How many one year old games did you found? I bet
many. Do you think the store keeps them just to make the hall looks better? Nope, they keep them because they sells.
Let's take another example: Xpand Rally. Techland didn't relase it yet in the USA, Spain, Holland, Italy, Sweden, Denmark, Greece, etc., etc.... Then how first 6-8 weeks can be critical for them? Just imagine losses in the USA only - the biggest game market on the world.
So, when really big money come?
They are rendered during whole a so called "game-life time" (my personall opinion).
Think about it.