5m per month is excessive, not every FC is raking in that much.
But in principle, yes, an active FC should be able to pay something.
Maybe 100k/200k/500k per month by the size of the house. But in exchange, they're exempt from demolition and the gil is automatically removed from the FC chest until there's not enough, then it gets the 15 days demolition warning.
This way the house is maintained by any members who deposit gil, not just the leaders activity.
