I can't really chime in on the end-game stuff, because I'm not there yet.
As a lvl 39 player on my primary class right now, I can chime in on what I've seen over the last 10-12 days or so.
One thing I noticed was that, upon completing a quest, I could select gear or slect Allaghan pieces that I could sell for money.
For the first 12-15 levels, I would take my gear.
Then, I stumbled onto the market board and I started to notice that all of the gear that I was being offered... was selling for FAR LESS on the market than the amount of Allagan pieces that were being rewarded.
I find it very weird that I can either take 4 silver pieces (2,000 gil)... or, I can take a piece of armor that I can go right to the market board and buy for 350-700 gil (that is without sitting around and waiting for a better deal).
It's kind of the definition of a broken economy. Either take something that is selling for 600 gil... or, take the cash prize of 2000, buy the thing that was selling for 600 gil, and have 1400 left over.
I don't know what the answer to this problem is, but it's something I've noticed. SE's intention was obviously to have stuff sell for the equilivent of the allgan pieces being offered (I don't think they wanted to rip off players who decided to take gear rewards... maybe they did?)... but universally everything is going for FAR less.
To take it a step further... the drops in the dungeons are generally far better than the quest rewards. So really, it's not take 2000 gil and buy a piece of equipment for 600. It's, take the 2000 gil, then run a dungeon 2-3 times and get outfitted in superior gear... and along the way, make a few thousand gil via running the dungeon (after repair costs) AND pick up gear that you can sell/flood the marketplace with, along the way.
Again, I don't know what the solution is (maybe have gear break? I don't know), but it's obviously a problem.
And on top of it alll, you don't even really need to religiously upgrade gear prior to level 35 anyways.
If things at end game are anything like what I've seen on my journey up to lvl 39... I have to agree with the "economy is broken" crowd. It really is.
Then again, if there's no need to buy anything (because superior stuff that never breaks or can be lost is obtained via dungeon runs), is there any real need for an economy? That's another topic for another day I suppose...