I know mintdice is focusing more to improve the site, but I think mintdice should try to have more active players who play regularly.
The best way to build long term value (and the most honest one) is to create product that everyone want to use. That's why mintdice is focusing to improve site, provably fair mechanism, games.
Promotions and loud marketing boost number of active gamblers only for short term if the product is poor.
good marketing (sign campaign)
There are only 15 bitcointalk users that are promoting the site with total of 500$ weekly payout.