CCC still have this crazy way of selling tickets, where you cannot know more than month in advance if you will be able to get a ticket, i.e. impossible to book hotel/flight that late.

To be fair CCC is theoretically primarily a German club with an event that is overbooked by so so many people, all of that is done by people NOT being paid for anything (from security to health emergency to infrastructure, ticket checking, audio, recording, etc.).

I wouldn't call it crazy that a pure volunteer event that constantly has to switch places because they use up ALL available space of their venues does have a ticketing system that is still better than the one of a lot of big pop stars.

It probably also keeps commercialization down to a minimum.

Yes, sucks that what you describe isn't possible, but I think in perspective it's not exactly "crazy".

It's still always sold out with whole conference areas and more used up.

If you are even unofficially part of CCC or a loosely-CCC-affiliated group, you stand a decent chance of getting a ticket during the first phase, where tickets are distributed to these groups.