The imbalance between the number of people willing to pay $1600 for the conference and the number of tickets available is so enormous by this point that there's simply no way to make it fair. It doesn't matter if it's first-come-first-served, or a lottery, or if you give preference to people who went before, or people who haven't gone before, or anything. No matter what you do, you're going to leave out a ton of people who deserve to go.
The event needs a bigger venue or some other radical change if it's to avoid leaving a lot of people out in the cold. Maybe Apple doesn't care, and nothing says they have to make any changes at all. But if they do care, then something really has to give. They need a vastly bigger space, or multiple conferences throughout the year, or a higher price, or something to manage the insane demand, if they actually want to improve this stuff.
Who really cares about the content? A ton of people. Buying a ticket only for the keynote is simply not a problem, and it's obvious just from being at the conference and talking to people who go or who want to go but can't because they couldn't buy a ticket.