Haven't been to one in many years. They are not what once were, there was a time when they were something to see. With the internet that changed everything.
Places like the RPF is not unlike a Con, you get to see amazing things guys produce. Hear all of the stuff that's going on, even buy things from the best dealers room in the world(that's why I went to Cons in old days). Best of all you save on travel expenses, hotel rooms, meals, etc.
Of course there are things that will be missed. This stuff isn't as much of a novelty anymore, things one would learn at a Con go on here everyday. You don't get to meet people face to face. Or get to experience the zoo of characters that wander a Con.