One of best things with Duelbits contest is, they allow to bet with small value. I could be wrong but I think their main aim is attracting new users to their casino, and not try to steal money from failed bets in their contests.
If they want to force gamblers to bet more, and get more money from gamblers, they would require high value of bet to be eligible in their contests.
That’s basically what duelbits is doing right now, gathering as many people as possible, and they are doing it with each marketing including their signature campaign as well, no matter what they do main focus seems to be getting as many people as possible. Whales are the make or break of any casino, they need that for sure but right now they are focusing on getting anyone, even if it is a poor person because they want to have a big number of people playing right now.
In this case, it is better because if you have that it usually means that you are going to end up seeing whales come here a lot easier, that way they could focus on getting whales later on when they feel like they are more ready for whales because there are already a lot of people playing and enjoying this place which whales will be looking at when they are deciding on playing on a new casino.