The first noticeable gold sink was the new castle and keep customizing and I guess you even get that back if you want to get rid of it. We should have high end gold sink items.
Its not the first, but ill mention a few more:
Castle deed from NPC cost like 900k-1m gold, at the time it was introduced it was alot of gold. But then again in 1997-1998-1999 there wasnt much places to put a castle
So I guess this didnt draw alot of gold. As a moneydrain it must have been quite ineffective.
The cuztomizable plot which came from AoS (around 2004) cost 33k-187k for a plot, depending on size + money for cuztomization of house with walls and tiles., still exist today. Imagine the huge chunk of gold it has drawn from the game since then. (But the bad thing, if you demo the plot you get money back doh!) idoc however draws money out of the game.
the rope to buy to get into poroximus 5k, bought a million times over the years, also abit of gold.
Item insurance, if killed by monster, boom 5-10-15-20k each death out of the game.
City loyalty titles, upto 50m for the best, in total alot of gold drawn out of the game.
The real first moneydrain must be the hairdye/beard you could buy from NPC for 500k, alot of players had this.
All these are examples of moneydrains still existing in the game today, but Id say even combined it wasnt enough money drain.
NPCs sell stuff for 5gp, 30gp and 120gp etc, we all just laugh at the NPC, "hey everything is free". But for a new player starting with 1k gold those prices are pretty serious.
Old returners who have 10-15million gold which might have been alot at that time, will ofcourse fall of their chair hearing prices of hundreds of millions or even plats.
Luck for the returners gold is relatively easy to get, champing, idoc, trading, claiming vet rewards, selling houses, vendors, quests etcetc
My conclusion:
The reason gold exists in 10s-100s of plats now is that nearly everyone active xfered their char and gold to ATL so it became so consentraded. If you took all ATL gold and split on 25 shards it wouldnt be so much.
Even if gold exists in hundreds of millions or plats, it should be taken down to earth again with more money drains.
Money should be a factor, even when buying from NPCs or other players. More moneydrains are needed.