Bots definitely are a part of it with how many people are waiting in queue to grab them probably. But, the queue system itself is just shit, man. It randomly shuffles everyone who joins it. So, you can either join it right at the specific time it fully opens (2pm est), or you can wait 3 hours ahead in queue and it makes no difference, because, it'll just throw you towards the back if you're unlucky.
Honestly, they should either do a lottery system, or just do first come first serve without a waiting queue. They limited the amount you could purchase per account thinking that makes a difference ($30-60 IIRC), and it probably does a bit. But, it's just not enough.