Oh, and to answer the question of how to find out about things earlier. One good way is to keep your eyes open...
Let's say you notice in the Baz that a certain player, let's call him HalflingMan, is auctioning some items at below half price. The next evening Mr. HalflingMan is auctiong the same items again real cheap. Duh, research those items on allah and figure out where HalflingMan is spending most of his time ... it ain't that hard.
Here's an actual story of mine from last year. I was browsing a web site that listed actual recorded selling prices of items gleaned from submitted player log files. I wanted to find a tradeskill something that I could make and sell for a profit. Certain fishing lures seem to be selling at a rediculous price. The database must be wrong, right?
So I made a couple stacks of lures and put them in trader at this rediculous price, and they sold that very night. Now most of you know this one already, (it is long since nerfed) but it didn't take much deduction to figure out why they were so valuable. They had a high tribute value. This was all about deduction, keeping my eyes open, and turning over some obscure stones. I learned this one months before it became widely known. (I didn't have MQ at that time to tell me tribute values, I was a newb and barely knew what tribute was.)
There's your example. Tinker, experiment, and keep your eyes open for what others are doing.