While I don't particularly care for 1v1's myself, they're a lot easier to manage. It's not as simple as just "throwing in 2v2 or 3v3." With that you have to deal with a whole new layer of complexity dealing with team registrations and whatnot. It's better to keep things simple at first, see how they work, then throw on some more variables. I'm sure there will be other ladders soon.