Yeah, the promotions are the important particle here as well, they are making a lot of money for sure but with promotions they are dropping their profitability a bit, they could once again use it to gather more people but instead they are marketing themselves to their own customers which is really amazing. None of these promotions are done to get new users, this is purely for people who are already playing here and trying to stop them from getting bored.
It's a cycle: Promotions > New users > Higher income > More funds allocate for promotions > Cycle repeats again and again. In addition, you are right that promotions run not only to catch eyeballs of potential new users, and have new users to increase total income for the platform, but also to keep most of current users to keep using the sites. Over time, the site might have loyal users, and it's amazing to build up a strong community like this, partially via promotions.
Well it is a really great strategy to keep your business running .
A little bit of money as an investment to a great success,It is really worth it and you could really see that it is working perfectly .
The site attract so many gamblers and those new and old gamblers would always join this give aways and challenge to gain more profit than their regular winnings.