Without Time limits, the exchange would be FLOODED by people pricing things 2 credits lower than the rest. Eventually everything there will be so devalued that it would defeat the purpose of the Exchange in the first place.
The time limit is there for a reason. Before they had the time limit the exchange was horrible. Now you price stuff to move or it goes back to you. I'm glad we won't be seeing your items on the exchange, that's less pricing competition I have to deal with.
From my viewing many items I saw listed on the exchange, it was obvious to me that many people were using the exchange as a replacement for the short space in the bank. Items were posted for $XXX Million Credits, and were left there indefinitely. That should not be what the exchange is used for, nor the way it should be allowed to be used. I agree with a two week limit for posted items. If they do not move in that time, then they should be returned to poster for further processing. That is a good move on Cryptic's part.
Most things I have posted on the exchange have usually sold in minuets, rather than days. The only things that have not sold that I have posted are the Ship Engines, and the Ship Shields. Those I have pulled off and sold over the counter in the ship yard.