I've gotten plenty of chests from Jarl, but the reroll is rather pointless to me. I've never managed to get an egg from a reroll, and I think that is the only reroll that would make it worthwhile. Getting an elite gold chest instead of elite silver isn't even a big upgrade since you never know what you'll get from a chest and you can't sell elite chests. For example, I've never gotten a pink from an elite gold chest, but I once got 2 pinks from an elite silver chest. So the luck elixir pretty much worthless.