You are wearing a signature site of gambling yet you know nothing how to check if there is active players in a site?
not because there are no one speaks or talks about the site meaning there are no players because bitcointalk players are just part of the business and there are so many players fom outside this forum.
Maybe he knows how to check and he already check the casino in his signature but there are no players on it because that casino was too shady and have lots of scam accuse. I think the reason why bitvest is being talked about more than 777coin is because bitvest got a lot of games and it is more popular.
AFAIK it is also newer than 777coin so it is being highlighted the most but it does not mean that 777coin is a bad casino. I think it is already a good casino and players on this casino is already satisfied because the admins do not bother of revamping it anymore. Active running campaigns of the forum can also be a way to woken up the inactive gambling threads.