The update on friday made it so that when you solo farmed you got 1/8th of the drops you got before, including ecto. Everyone started buying ecto's when they knew that while it was still cheap because it was certain they would increase in price dramaticly since in essence solo farming had no more use (since no matter how many people you were with in a group you got drops as if you were with a full group) and thus ecto prices rose by the hour (quit litterally, when I went off they were at 13k and I think it went up a bit still after that)
The follow-up update made so that green drops, rare drops, rare material drops (including ecto) and several other types returned to their normal drop rates, and in normal mode the AI was decreased so enemies scatter only at very high damage (the VwK W/Rt build they don't scatter at all any more) so farming UW has become twice as fast as before the update for a good number of commen builds, so ecto prices have dropped under what they first were.
Hope this clears it up a bit
