The rewards are set up so that the less valuable prizes are awarded that's why they have percentages next to them. If you have a 5% chance that prize is being rewarded (roughly) to 1 out of every 20 players that complete the daily challenge that day. So the vast majority of your individual prizes will not be the prize you no doubt wanted when you went for that chest.
My advice is to look at it as a free chance for some good prizes. If you don't think it's worth it to complete then don't complete it. Just remember assume you are going to get the crappiest prize possible before you decide if it's worth it. Of course based on the lotteries and how much money they make I suspect i'm wasting my time typing this.