But being a registered member could be a reason to post more and more and become a real active member.
And probably you won't forget the forums.
If someone really wants to learn something, s/he would take their time and register.
Registered members have a location.
Although it sounds unimportant, it can help other members.
Germans make other typical beginner mistakes than Italians etc.
And you don't know anything about a guest.
So maybe I (and others) would have better chances to help someone if I (we) knew their location/native language.