ANYWAY. My teasing of @faraday aside...
I've talked to @Ghost about this and we are also on opposite ends of the argument here (so v. much agree to disagree) and I have had experiences similar to @Rook.
The last time I tried to play on a game in a capacity of 'I am not sharing who I am, I am not discussing who I am, etc etc' (for a variety of reasons not the least of which my RL was a mess at the time and I wanted a nice big divide between game time and RL time)....... I couldn't get involved.
People didn't seem to want to RP with me (and you've all, I believe, seen how vocal I am on the it's not hard to get RP if you offer it along with hooks! front). People didn't engage me. People didn't bring me in for plots (I had many offers of 'sure, I'll include you!' suddenly dissipate into thin air). It was this wildly passive aggressive landscape where people would give the air of politeness and respect when they were directly dealing with me and then snub me and turn their backs the instant we weren't in the same 'space.'
But when I have identified myself, even in spaces where I'm around people I may not be on the best of terms with and I just play the game even if I am saying 'Hi, I'm Auspice!' ... I have a much better time.