Good number of active players? How many? Just visited bustadice now and i've only seen 3 users playing on there, the nick are trauma, michisobu, and Yu35.
You've missed the other active players then.
Total bankroll doesn't mean anything, it's just sum of people's investment.
When a casino is new, many have been talking about the bankroll, the security of a casino/dice site and it's reliability. If total bankroll doesn't mean anything to you then those who have a standard of a casino having a good amount of bankroll won't say a thing.