They take things that could be a good mechanic and turn it into an expensive tool to make sure gold doesn't get devalued. In spite of the fact that this game's economy is non-existent because the only way to trade apart from crappy guild stores is to spam WTS and WTB in zone chat.
There was a thread called "gold sinks for the future of ESO".
I HATE THAT THREAD >:(. The items listed there should be given as a reward for a long questline, completing a difficult dungeon or some other feat that a player performs. Instead of rewarding us a piddly amount of gold and saying "grind the rest" just to get stuff that costs thousands of gold (houses, guildhalls). It can still cost some gold, but it shouldn't be an outrageous amount. Also, why have it cost gold when you can make it into additional stuff for the player to do?
http://forums.elderscrollsonline.com/discussion/109019/gold-sinks-for-the-future-of-eso/p1
HORSES: Should cost 8k instead of 17, and a lesser verion should be given as a quest reward (a mule or donkey) and 42k is fine for a better horse because that's a late game horse and everyone already has the money they need for it by VR1.
HOUSES: A starter home should be available for free after doing a certain dungeon/questline, and the rest should be able to be purchased after a dungeon/questline for 10-100k, the cost being determined by what city they are in and how nice/big they are.
GUILDHALLS: should be tied to something your guild achieves as a team, rather than the gold that some rich guy donated to buy your guildhall. For example, guilds could participate in one of a set of events depending on their size (any guild with 30-300+ people). they would need at least 15-30% of the guild to participate (Depending on the size of the guild, with smaller ones requiring a higher %. nice and low because not everyone is on at the same time, or wants to do the event necessarily). Successfully completing the event would give them access to 1 guildhall in any city of their choosing, with upgrades and extensions being available through further events.
Also, you should be able to construct a guildhall addon to keeps you own in cyrodiil. This would give you a HUGE incentive to hold the keep because you've invested time and energy into designing it, as well as (some) gold into buying the materials to build it.
FOLLOWERS: Should be willing to join you if you do something for them in a quest (not quite as easily as skyrim though, were if you delivered a letter for them they would follow you to their death). Mercenaries should be available as an alternative form of follower, and they would cost 1-2k for 4 hours. They could do anything except group dungeons and solo stuff with you.
CHARACTER COSMETIC CHANGES: This is something that can be a goldsink. I'm actually OK with this costing some gold because there isn't a much better way to integrate it.