Admins are banning only afk leechers. Today, I just started my first session and saw about 8 naked people in my team, admittedly, with some weapons. But they were naked! Yesterday, the guy in my team joined without any weapons and was just running around for an hour, while everyone was pissed of because of multiplier. There were no admins present, and the first kick poll didn'd get through.
Idea would be to make it obligatory for a player to wear certain value in equipment, based on the amount of gold he possesses and value of equipment he/she owns. For example, when I go to Strategus, I see that value of my equipment and gold adds up to 32000. Lets say there would be limitation which would forbid me from joining a server if I am wearing less than one third of this, which would not influence my cashflow too much, and it would still prevent me from playing naked or without weapons.
PS
I admit I have no idea what to do with ninjas. Maybe they can donate excess money?