I didn't see anything of this Award show, so I can't really say anything to that show... I think this doesn't matter for Imagine Dragons if they win this award or they don't - it's "just" an Award and they already have many of them.
You said they were nominated for best album of the year? I have a big question tbh, why is Smoke + Mirrors not really that successful? I don't get it... in Austria at least there wasn't a big hype around the album, but Imagine Dragons was probably one of the biggest, if not the biggest band in 2013 for Austria?! Well, this just confuses me a lot... how was it in
America and other countries?