You misread the number of wagered bitcoins. 22k bitcoins would be ridiculously high, Dean was talking about 22 Bitcoins (still more than 100k $ in fiat terms).
You can always check the current number at the top of the dice page:
https://betking.io/diceAs of now the turnover is:
more than 9 LTC (this seems low)
more than 149 ETH
more than 175 BTC
Will there be any specials for certain milestones? E.g. a price for the user, who places the 10 millionth bet?
Indeed you are right. I wonder what my eyes see sometimes! Just realised after making my account there the updated numbers, they're still mighty impressive. I'm just about to make my mind up about playing at this new site. Something modest, though, probably a single Litecoin I have lying around in some exchange. If it confirms quickly, I'll be wagering from tomorrow. So maybe you'll see that LTC total crawl up a bit =)
By the way, didn't the old Betking have an investment option? Or did the ICO funds take care of the bankroll issue?