Tickets cost 15 gold per to purchase. What some might not know (though most probably do) is that merchants also BUY tickets back, and not at the usual 50% of cost, but at the full 15 gold per. What does this mean to you? Well, assuming you have only one account and are quickly approaching the 1000plat limit, you can simply exchange your gold for tickets, which have the wonderful property of never fluctuating in price. Yes, it takes quite a few more tickets than it would ecto, but ecto was 13k per at a time and what did it go to? 5k maybe?
As I said, this isn't the most efficient scheme for gold storage (around 170k max per character, thats stacks of 250 in every slot), but it IS an option that is available and completely involatile.
With the removal of most of my materials from inventory/storage sometime soon with the expansion update, I'll have plenty of room to store my excess gold in ticket form