waiting to see if there is a promotion at yolodice too
milestones like that especially for a relatively new site do mean alot
if you compare yolodice with some... older sites ,they have 21+ billions bets
EACH
and counting,they also hold contests each billion bet and it is a very good way to attract more bettors
+ keep the topic at the top,so more bitcointalk users see it and may register to try and win
Online gambling has become a very competitive business and if one wants to survive for long and want to attract more gamblers to the site then they have to come up with some innovative promotions.
The achievement of reaching such number of bets is not the most important thing imho, it does not matter it is fast or slow because the main important thing is the wagered amount. It is useless to have so many billions bets but the wagered amount is lower than the one with less billion bet.
Once if you have more rolls and fast automatically site will make a profit but if rolls are the small amount they may make less profit but more and fast rolls attract many new players to the site.