The Economic Problem:

-Gil Sinks
1) Markets - 5% tax on sales AND 5% on purchases = 10% on all transactions
2) Travel - Teleport, Chocobo, Airship
3) Repairs - Heavy Repairs at lvl 50 on high end gear

-The Why
All MMO's need a gil sink method to stabilize inflation. How this is achieved varies from mmo. If they didnt exist it would not be long before currency would devalue quickly. This may not harm long term, steady players but for any new players coming into the economy, it would be very burdensome. IE: i am a new player and cant afford the 100k ring with my measly 230 gil per quest.

-Crafting Conundrum
1) Almost all gear can be bought from a vendor at all levels, for way less than we can produce it considering cost\time\profit.
2) Quests give out gear on almost 75% of them, leading to a massive massive flood of items.
3) No real way to compete with Instances\Raids for top quality gear