I've had that happen before with too many items to count. It doesn't help that I just came back from a very long hiatus, so I'm not sure what's what or where anymore! (News of Kyoko here got me to come back. heart)
This is why I keep a long list of wanted items hidden somewhere in my guild. If I was to come across an item I want and there is an obvious AI/lack-of-supply going on, I can simply move onto the next item in my want list. By the time I get back to it, the item may (or may not) return back to its normal asking price.
WOAH people actually buy gino buckets? I remember having the hardest time selling time selling it. Took about 3 weeks gonk finally sold it for about 100k...
I blame this on "How Can That Item Be That Inexpensive" (it's a thread in GCD)
It lists some great deals, but once those are snatched up, it's AI'D LIKE s**t.
The prices go back after a while- I've looked at the prices of some of those items mentioned in the thread in the few days after they're posted & then a couple of weeks later (which reminds me I need to grab a Winner's Circle). Very simply, if people don't pay the prices for the listed items, they'll gradually deflate to their original point.
I could list an Ocean Summer Top for 2 million gold, but unless someone bought it, it's not like my attempt to get well above the average price for an item has been successful. There's got to be a low supply & sufficient demand that people are prepared to pay the increased price.