Uhm. For me it snowballed into more than originally intended, but in my case that's a good thing. I'd rather not be completely in the driver's seat. I also don't need to know what exactly I'm in for. I find if I know too much I get in my head and am not "in the moment" as much.

I also use it as an outlet to talk about the crappy thoughts I have that I wouldn't want to share with someone I know personally.