mcxNOW is essentially dead, it might do 50BTC or so worth of MAX each day and that's the biggest coin. Realsolid hasn't delivered. The last news post was like Feb 09.
The number of online users is bogus, most of those people probably don't even have a browser open on mcxNOW it just caches past logins.
The user counter isn't based on how many people are logged in. It's based on how many have visited the site in x period of time. Tons of people are flooding the site with rotators and such to get free ++mcxBUX for referrals.