Yes, yes, there are people doing that - but they don't influence which raid you end up in nearly as much as you seem to imagine they do.
In short, what you are complaining about is not an actual problem for anyone - including you.
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This is a thread OP lol. If you feel like the roulette is being manipulated and as such you can't do relevant content then just queue for what you want. The main purpose of the roulette is to help new people get through old content and rewards a ton of xp. I mean if I want a token from Ridorana wtf would I use the roulette? I wont get any xp and barely any tomes to make rolling that dice worth it. If you think using the Roulette will save you time that's just silly. Queue for the 3 raids you need get your tokens and be done.
I do shit like this all the time if I don't feel like doing certain content, who are you to tell me I should have to run it? Maybe I'm a returning player trying to brush up on my skills and don't want to run the hardest alliance raid? If you want to run the hardest content, que directly for it.
Sometimes GM's can screw up and tell you something they aren't supposed to. It happened to me in World of Warcraft. It may have happened here too for all we know. Just because they aren't supposed to do or say something doesn't mean they won't by accident, they are, afterall, human.
Just queue for the raid you want to do. No, seriously. Full stop! If you want gear from a raid, do that raid. No, there is nothing else. I don't care about how often something might pop up or anything. Go do the raid if you want that gear. FULL STOP. Other people abusing the system won't affect you and doesn't even matter.