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Have you taken a peak at your deposited collectibles? If not, then you might want to check and see how much gold is sitting in there waiting to be used. Every few days I go through and process what's in there. If the items won't sell for a profit on the trading post, then I check to see if the mystic forge will take them. If memory serves me well, then you can combine mystic forge stones with jewelry to try and improve your combinations at the forge. Obviously you can take some of your collectibles and craft more valuable items as well.
On any given day, I might find as much as three or four gold just sitting in my collectible storage tab. Why let that go to waste? Be sure to check and get into the habit of unloading those materials every so often. What's more, if you go over 250 of any collected material then they will have to be stored in your bank or personal bags.
In case you have absolutely no idea what I'm talking about... this is where your collectible storage tab is:
You can double click items in the collectible storage area to place them in your bags. I wouldn't recommend right clicking each one individually to sell on the trading post, especially since normally you have dozens of different items worth selling.