$9 is not too much but yeah it can be abused. I'm thinking that surely this kind of promotion can make a good amount traffic in their casino but I'm guessing that it's only temporary until the promotion is gone. There's also a chance that the traffic they can get is from those multi account users which is basically not helpful from the casino given that they are only looting for bonus. I'm speculating that they will lose some of their users if they reduce or limit the bonus or remove it permanently. Well they are still trying and experimenting with the promo but I'm guessing that it will turn out that way as I've seen many casino turns out like that.
$9 is not much, but some people (read a lot of people) are ready to make +10 accounts (in some cases even more). So they claim a bonus and if they finish the requirements they will make a withdrawal and move to the next account. It's the same with faucets, I believe that many people abuse that as well by creating many accounts.
I've seen many casino who have been abused because of promotions and those abusers are somehow creative on how they do things. Multi accounting is one of the most common thing they are doing and passing on certain verifications are the one that makes them creative. Casinos have precautions for those abuse such as using bitcointalk accounts for claiming those bonuses but sometimes there are still abusers who get pass those precautions .
Btw I'm glad that you have recovered and unlocked your account with them. icopress their signature campaign manager also did his best as a bridge for contacting neodice team. The support team seems acted fast and this can contribute to the reputation of neodice.