When you talk of punishments for those that idle, you forget one very basic fact.
When you play Avalon you have' in effect' taken out a contract. The terms of play are simply that you have\" 1 month of ulimited play\".
It does not specify how you play, when you play, or any penalties if you play in a manner thats is disliked by others.
So, if someone is the only player on their account and chooses to idle to earn lessons, I fail to see what can be done about it.
They have paid to play. It's as simple as that.
Written by my hand on the 10th of Agamnion, in the year 1019.