When accepting a prophecy, it often stalls and doesn’t properly accept it, forcing you to miss out on something you used a lot of favor to reroll, then rerolling again to try to get another.
This literally can and has cost hours of play time, sometimes doubling the amount of favor to get a desired one to stick due to all the waste.
Just now I spent over 5000 on rerolls after spending as much to get a desired prophecy in the first place, and it vanished.