Welcome back!
You are back again and decided to run signature campaign so signature campaign should be long, long campaign will help gain popularity. However, there are many low budget gamblers, not able to deposit many dollars at once, this casino requires a minimum deposit of $15 dollars which may be high for many gamblers, it would be better to consider this. Wishing you long success, best of luck.
Usually they are just evaluating the result of the marketing efforts they made that's why casinos and other platform stop their campaign for awhile. Also since they came back here and running their campaign for another round again so we can assume that they are happy with the result they get then want to increase more their exposure to lots of gamblers on Bitcointalk.
I guess nothing wrong with the minimum deposit they set. Maybe they are not targeting those lowbies and trying to deal with people who can deposit on the minimum amount they require.
Looking forward for more tournaments also giveaways.