Based on alot of people talking about it, I've come to the conclusion (that may be wrong) that PrimeDice is the most popular bitcoin casino. But why? I can't use primedice in my country, so I don't know.
Is it the community?
Is it the increasing faucet?
Is it the good looks?
Is it the good reviews?
Is it the knowledge that they've survived more than a million dollars in loss?
Yes Primedice is the most popular gambling site in the bitcoin world. IMO this is mainly contributed to the good reputation of the site and of the owner Stunna. This was the exact reason I started playing PD back then, and I believe many went to PD for the same reason.