Sometimes I want to watch a trade because it's an item I have to sell as well, or it's an item I don't have the currency for at the moment, but want to find it when I do.

Maybe I am just really nosy and like to watch certain lions.

I would like to see a 'watch' button added to trades, so that a player can watch the trade and even get a notification when the trade ends.(Trade has been canceled/trade was bought out/trade accepted offer).

Possibly the lister can get a notice of how many watchers the item has?

Not sure how feasible this is, just a thought I had.