Not really that old of a lady. Started in early 2005 here, only two years after it started. though I was in 10th grade. (I think your birthday is off in your profile, When Gaia started I would have been 14, and my birthday is in '89)
As for perspective:
In march 2005, the march donation item cost 7000 gold.
Last month's donation letter (now monthly collectible) cost roughly
12,875,000,000 gold.
For each 1 gold that the march 2005 letter cost you, it now costs you 1,839,286 (rounded) gold to get the same.
So, 600 million (600,000,000) divided by the inflation number listed above, is about 326 gold.
Sad isn't it? the gaia economy is still reeling from the massive influx of gold generators that generated simply enormous amounts of gold for relatively low amounts of gaia cash.
Governments have things in place to ensure that they don't print too much money. Otherwise the value of the money goes down worldwide. Things don't cost more, money just doesn't cover as much.