I'll be going to Vegas for the first time this summer. I am curious about how the reward limitations work.. Can I use my three rewards/30 days all in free nights at the same hotel? And if I purchase 3 rewards in 30 days but don't use them yet (they say use within 90 days of purchase), can I buy three more the next month to also use on my trip?
No, free room rewards are limit of 1 per user. No, the 3/30 limit is when you use/consume the reward. So the rewards would be used during your stay. Click the next button on any rewards and look at the Purchase and Usage Limitations for more details.