Because we believe in Satoshi and respect Satoshi's decision to hide his identity about him. Hiding the identity of Satoshi must have been carefully thought out and considered by Satoshi itself. We don't know the exact reason. However, since Satoshi has already decided on the condition, why should we bring it up and want Satoshi to reveal the real identity? Doesn't that mean we've crossed the line on the principle of "privacy" itself?
I think that not only the people on the forum want to know him and want to know his real identity, but many world governments also want to get to know him better. I think satoshi really needs to keep his privacy so that it doesn't leak to the public and he doesn't have to reveal it, this is a privacy that he must maintain if he doesn't want the government to control him.
If satoshi was still around or alive then I think he'd be laughing reading how many people really want to know him.