You can go to the "Players List", and sort by last action - so you can see who has done what recently. (That is where I got the number of 2,300 in the last month, and 1,700 in the past few days)

There are a total of 414 people that has above a "pawn" membership (Can be seen on the "Paid Membership" page) I know some paid members do not play here no more, and I don't have the time to go through the 2,300 to count all who activly play, so that is why I estimated 360-390 paid members are still active here - but again, that part is just an estimate.)