I think there is a lot of debate about that... There is at least one thread on here discussing this issue. It can cause problems because the sub may be seen as Topping from the bottom, i.e. telling the Dom what to do. That can affect the relationship dynamic. Look up the thread 'Experience Discrepency' as that is a recent covering this issue.

As for the local scene. Yes, it is true you can do without it and those who are shy (like me) prefer not to indulge in it. However, if you are looking for a mentor to help you out it is one of the better ways to do so because many are wary of those they do not know in person. Often you can make good connections online and build up to an eventual in person meeting but this is a lengthy and often unsucccessful process. However, attending a few local events will get you into a community of like minded people who you can talk to and they can get an idea about you and you can get an idea about them without a lengthy process of online communication. I am not saying you need to be turning up to fetish and play parties all dressed up with your sub following you on a leash with her tits out or taking part in demos. Thats too much even for those of us who are not shy However, finding out about your local munches and go to them. These are usually non play/non fetish wear pub/restaurant meetings where you just talk and 'network'