My suggestion will be simple and something (I hope) is easy to implant.

I don't know about you, but I'm tried of going from trade to trade, searching what I'm looking for. For example: A week ago I was going through the trade center searching for a stat replacer, I found one. It didn't have a buyout price, just a flat sell. So I stuck in 50 GB for it. Turns out, after checking the profile after a day or two, the player hasn't been on since May of last year.

So I took out my Gb, knowing I wouldn't get that lion :c, now this is irritating if anything. You find the perfect lion yet find out they haven't been on since back in May of the previous year. ~.~.

So my suggestion is this: The Trade will cycle through their days, even if you haven't logged on for the roll over. This way it keeps the Trade center clean and not filled with old Trades that haven't expired due to a player not logging on and rolling over.