I was going to purchase 4 single rides for an upcoming trip. I was thinking that I may or may not use them, just return if I didn't when I get home, but it looks like they are not refundable. There isn't a "Cancel Reward" on the reward after purchasing one. Also, it says a limit of 4 per person, so I assume if I bought 4 now and didn't use them, I'm SOL if I want one on a future trip. Anyone know for sure if a) they are non-refundable, and b) 4 lifetime limit. I'm not interested in the BOGO's, as I don't usually use the monorail, just figured if I had a free pass, may decide to save some walking. Thanks.