Just because you repeat what many people have already said doesn't sway anyone into believing you.
I am not saying this is a 100% guaranteed to hold up in court thing I am just saying might as well do it.
So far Ive heard no definite proof this does or does not work so until anyone comes up with anything I'm just gonna say might as well how much do stamps cost these days.
From the FAQ I linked to in the post above:
"
I’ve heard about a “poor man’s copyright.” What is it?
The practice of sending a copy of your own work to yourself is sometimes called a “poor man’s copyright.” There is no provision in the copyright law regarding any such type of protection, and it is not a substitute for registration. "
If you choose not to bother to read what the copyright office has taken the time to clearly explain, that is your choice.
But your opinions do not hold any weight against the law, so why not take the time to do a bit of research and find out what the process really is?
Edit: to spell it out very clearly:
1) You write a script mail it to yourself via registered mail.
2) You post that script with the caveat that it not be used in commercial projects.
3) I use your script in my commercial project.
4) You contact me telling me that you own the copyright to the script and I have to remove it from the game.
5) I respond asking you to show me a copy of the copyright registration.
6) You say you haven't registered it with the Copyright Office, but you mailed yourself a copy.
7) I say, "Thank you for letting me use your script in my project."
You would have no legal recourse because even though you own the copyright (and that fact may not even be in dispute), you never bothered to register it.