It's almost impossible to get them if they're claimed with 3 seconds of the message being posted. Unless you automate it or have lightning reflexes, you don't stand a chance.
It's unfair for people who genuinely wager (play a variety of games and slots, not just try to wager as efficiently as possible) and for anybody with a disability. On top of that, they're usually between 22:00 and 05:00 UTC, which excludes anybody in Europe who sleeps normal hours.
It could be based on loss and/or variety of play. Or at a minimum, RTP. $10k code for dice wager, $2 - $2.5k for slot wager. A $10k wager is still pretty ridiculous and degen behaviour in most parts of the world. I know they want our bone marrow here, but it's pushing people too far.