Prices aren’t high. It’s the exact opposite problem: deflation. The value of goods has crashed (many items selling at 1/3rd of their previous value). Goods have infinite inflation… they respawn every few hours, once spawned in, all but a few consumables exist permanently. Coin on the other hand has almost no inflationary factors, not to mention it is not permanent. It can permanently be destroyed.
I’m speculating here but I’m guessing we are at the point where coin is leaving the economy faster than it is being created. I’d point to hoarding, taxes, portal fees and players quitting (including a couple high rank multi-millionaires) for coins leaving the economy. These have likely exceeded the “broken” footfall creation (and other more minor contributors like leveling and quests).
It’s hard to say exactly why without more data. The speculation is, no one has coin, or wants to spend coin, because they can’t see an easy way to make coin back. This means the value of coin has skyrocketed.
I’m no economist, but it’s generally known that this behavior is deflation, and it’s the absolute worst place for an economy to be in. Ever wonder why Japan has what many people call the lost decade? Deflation.
In order to maintain a healthy economy, it is almost universally accepted that fiat inflation is required. It’s one of the few things that every country agrees on (although they do disagree on the RATE). It’s basically the single most important economic discovery since the 1800s.