Generell, you had and have nice promotions up and running. Unfortunately, you seem not to understand that prizepools of any promotion needs to be adjusted. Why would you gain more and more customers, earn more and more Money, building Eddie more and more mansions while at the same time Not adjusting the prizepools. Increasing prizepools once in a year or even more is not enough. What are you communicating with this behaviour? That you don't care about the players at all and that any Promotion or challanges is just made to make stake more money. We are at a Casino aren't we? You have an house Edge in any game so where is the House Edge for the customers? You could give a us chance to win and maybe you take a loss at least for one time with challanges because the payout is higher than what you earn through it.
Please add automating the payouts Like e.g. any race ends, the payout is available instantly. This should BE for all promotions and challanges.
Improvements:
1. Increase prizepools that the players actually have a chance of winning
2. Implement a registration Button for any single promotion or challange hosted on the site itself to avoid users getting coupons for maybe "randomly" hitting the multipler in the challanges specific Game to increase the payout for the users doing the challanges intentionally.
3. You could think about different prizepools each time. For example, stake hast to provide BetIDs for every challange and promotion where they actually tried the challanges itself. This hast to happen mutiple times e.g. 5.
Example: The challanges is to hit 1kx in limbo in a minimum bet of 1$.
You try this 3 times.
1. Try: 20 bets needed to hit
2. Try: 5000 bets
3. Try: 600 bets
So at your first try, it took you 5000$ to get 1000$ Back. Take all your tries and calculate an average to create a prizepool which actually gives the players a chance to get a payout coupon in a relation to what they may have lost to get the required multiplier.
These are Just some quick thoughts but I'm sure the players would Love them and you would actually Show that you WANT to give us a decent winning chance with your promotions and challanges.