No bonus, or promos, how can you attract new players? Casino industry is quite competitive, if you have nothing special to offer, people will play elsewhere.
Promos or bonuses will be not worth to try if they cant be a better site, not a shady site like what they are atm. They should build their reputation first before offering such promos or bonuses.
but promo are exactly needed first to build your trust otherwise why someone should choose a shady website like this over most popular well known dice game? if he can do big bonus and zero fee and zero edge, many would be attracted and i know i would play it he did this