As many people have already stated, Ecto is a rare material, it is not, nor was it ever intended to be used as currency. If you kept a ton of ecto around without ever realizing the price could change dramatically you kinda deserve to lose your money.
There are plenty of other things you could have invested in that wouldn't cause you to lose money (ie. things like lockpicks). But no, you didn't. And, yes it would be a lot more work for you to invest in something other than ectos but hey nobody ever said life was easy.
You chose not to invest safely and securely. You, and only you, risked your money when you didn't immediately sell the ectos as soon as you received them.
Anet has restrictions on the amount of money you can hold on characters, on accounts and for trading purposes. This was no accident. They have done this on purpose because it is how they want their game to be. No harm in asking them to change it, but don't be surprised when they don't.
And finally, want to know why the price is dropping? Obviously people have sold tremendous amounts of ectos back to merchants lately. Don't blame Anet for prices dropping, blame your fellow fat cats for making the bottom drop out of the market. And further blame them for not keeping you in the loop about the sell off.
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