Prices Changing?

yea i know that the prices change of some items at a vendor but why do they change?

it's based on how many people buy a specific item from the vendor versus how many of that item gets sold to the vendor. It's Supply and Demand. If no one sells to the vendor and people buy like crazy, the price goes up. If People constantly sell to the vendor, and no one buys from the vendor, the price goes down. Simple economics there.

ok thanks does it take like say with black dye its around 7k at the moment
if i was to sell to the vendor about 15 black dyes would it go down to like 6k or 6.5k or would it only go down by like 100?

I don't know by how much it goes down, but I think it goes up/down fairly slowly. I've noticed that if I sell like 10 sets of 10 to the Material Trader, I start to get less and less for each of my bundles. It goes down by 5g there, I think. Can't remember off hand.

ok so its not like one person can make a big difference