Go through auction orders, and look up all ME items. Count how many of each been sold in auction. Total that number. Now compare to number of active avatars in
EU (gained from entropiatracker, ~3000).
Now compare that to number of registered accounts.
What is num_accounts/num_ME_items_sold? What is num_accounts/num_active_players?
A number between those figures is the amount of the disciples you could expect to take on for one to graduate. Any above that and you would be considered fortunate to have found a good disciple.