There is also cases in which there is fg taken out of circulation like a part of the prices for
Hourly Raffle tickets goes back in to the forum bank.
The same happens for any sales in the d2jsp game
Ladder Slasher, where 5% of any fg from item sales goes back into the forum bank.
Additionally there are features like topic titles (bold/red/italic), guild and guild feature purchases etc. that will be paid to the forum bank and remove fg from circulation.
Don't forget when scammers fg get removed, they don't get it back even once unlocked.