The argument that danm put forth has been put forth many times. It has also been discounted several times. If danm wants to stay away when he hasn't seen the GP, then I won't stop him. As I posted, he is free to do so.
However, this is a FORUM. Our lifeblood is visitors. There are several forums, that are not the F1 forum, or even have ANYTHING to do with F1. Yet, if we do not enforce the spoiler policy, you cannot visit any of the forums here, without risking spoilage of your race.
A signature picture that announces Buttons first win is really a problem for the dude that went into the other games forum, and sees that sig. It is a problem for us, because people will on a regular basis opt out of coming here. This is not fantasy. Try and search and see how many times this, in various guises, has happened.
Imagine your favourite GP4 modder misses the race, but has a release due on monday. No spoiler policy, and he doesn't appear. No one knows whats going on, and you get these threads where people ask endlessly "Where is he, when is the release, what is he doing?" In reality, he is just waiting 5 or 6 days to see the race his friend taped, because he had to babysit his sisters son during the race, but he can't come and say that, for fear of a simple signature or random post can he?
These things cascade like ripples in water, to the detriment of the overall enjoyment of these forums. This is the problem that the spoiler policy solves. Even if you cannot see it, it is for your own benefit, because it keeps this place alive and vibrant.
I don't care if you are against the spoiler policy, as long as you respect it. Say "NO" all you want, but you won't change anything. I am not trying to convince you of anything either. However, if you want the spoiler policy to change, it is a mandatory requirement that another and better way of solving this problem is presented. This has hitherto NOT been done.
It's only after we've lost everything, that we are free to do anything.