Other people on your email may also be interested in the answers you get - may be now or in future. It happens all the time on the mailing list I use. People request others to consolidated answers they has received for the questions they asked in past. That's what gave me this idea. This way they get to see them easily at one place without any extra effort of manually consolidating every now and then. I hope overtime it will build into a community knowledge base of common questions and answers.
I'm still struggling with the question: How is this different from just sending an email to all my friends?