I’ve rerolled every day and I’ve never seen a 1500, I think you could equate this to the rarity of a 100g quest. I also saw a list of dailies and 1200 exp wasn’t a thing.
Even then comparing
1000 exp : 1500 exp quest
Is like 30g:45g
Now old system
60:100g
There is a 40 gold difference on the high roll scenario in the old system and 15 gold difference in new… like I said weekly experience doesn’t change, there is no high roll.