Let's talk about Alliance roulette and ilvl cheese for a sec.

[Remolia]

We're asking for better incentive to make full use of the roulette. Purposely narrowing the selection to prevent landing in any raid above Syrcus while keeping full roulette rewards defeats the purpose of having a roulette to fill alliance raids at all levels.
People will still cheese their ilvl, there's no changing that, but lets at least incentivize players to make later raids possible without irrational queues.

Having CT blacklisted will make u more secure, when u queue Alliance Roulette, some people refuse to play Alliance at all, coz they fear to pop into CT, which leads to missing people in 60+ Alliance content.

It also will gather some stats about alliance "(un)popularity"