Duelbits took just over 3 years to become a fast-growing casino.
Three years are not short time and Duelbits team actually spent a lot of time to build and operate their business over years to achieve success we see now.One of the reasons I agree that it's one of the fastest-growing casinos in the space is their aggressive promotion. By saying aggressive, I mean they have big money on their promotions, which can easily entice us gamblers to participate. Since they have a solid reputation on Bitcointalk, it's easier for them to convince us to join them.
Their promotion propaganda is big and long lasting, or in other words, sustainable. It makes me believe that Duelbits team actually find that their business get benefit from their promotions too and this make their marketing programs are more sustainable. By running marketing programs with part of business income and profit, it's sustainable model as it no longer relies only on the team and business pocket without good money return flow. 
