User blog comment:Rodd XY/Side Decks and Why They Should Be Available Sooner/@comment-24423693-20140404160801/@comment-24785416-20140410041354

They may want to introduce Side decking later as a means of testing to see whether or not certain decks are strong enough without side decking, aside from deck types that will have a distinct disadvantage because they are still waiting on new/better cards. In a way it's unfair because then with this first official match occuring there aren't enough cards to go around, which will result in TONS of people all playing similar if not exactly the same kind of deck. Also, easy answer for why they want you to pay so much to go to an expo for the match. Money. They need it. xD But hey, it's what they have to do if they want to keep this product alive. More power to them.