The convention is mostly for training and the training covers all kind of topics you can think of. Where else you can get that kind of training (3 days) for the amount of registration fee???
Food, beverages, t-shirts, training from beginner to advanced and the biggest advantage is networking (knowing people that are experts and being able to tap a little bit of that knowledge because they know who you are). For all of this it is a minimal cost.
Yes it is