^ I think it is already answered by them, that is why there is a promotion to lure gamblers. The 110% bonus is quite enough for a new user who deposited and to test the site. It is 10 years of service I am right?
As the said above, welcome to the forum and have fun here competing with others, there are a ton of dice gambling, sports bet and etc on the different platforms but it seems your gambling site has everything they want. Promotion is one of the marketing strategies that still has a good effect on the gambling industry, we are expecting this soon here.

I'm sure DCP (Dagchip) is not an altcoin, it is just a chip to play their games.
Just like when gamblers go to land based casino (especially poker games) they will need to convert their fiat money into chips so they can play on the poker table with that chips.
Once gamblers finish their session, they can convert the chips back into fiat money in the cashier.
Here in this site, once you make deposit then your deposited money will be converted into dagchip and if you are going to withdraw, this dagchip will be converted into real money based on what currency you want to withdraw it.
Actually it is similar to the one you can find in come casinos such as duelbits and rollbit, where your deposited money is converted into "coin" where 1 coin worth $1.