You're right. Not comparable. You get more from a faction than a regalian house. The tax limit should be raised to 25 regals per player.
This is why players should be taxed longer than 3 days:
They get to stay in the faction for atleast 30 days before they're kicked. They get a house, or can create their own. They get access to facilities that a faction has, like farms angd dark rooms (these facility's must maintain themselves trough tax aswell). You host game nights, and sometimes pvp events. A member has access to everything. But if you log offline, your leader has to wait till your kicked from inactivity to remove the innactive players locked chests. Sometimes innactive players take up space regardless if they've played the last 3 days or not. And us faction leaders have to pay for it.
Remind me, how many players do you have in your faction? When's the last time you've actually had to deal with members? I helped Aeris reach 100 members up till a week before the malfunction. I know exactly what it's like.
When you actually lead a legitimate faction, come back and give your comments on this thread.
