You mean roleplay as an existing person?

Cause I've seen RL themed RP's all the time, high school life, fighting in a real war etc.
But specifically going "We're the mythbusters!" is a new one... and I had over 20k posts from RP's back on the old guild.

Personally, if that's what people want to do then more power to them. But it's not something that I personally would have any interest in joining.