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I like this idea a lot actually.

Currently the notification system that's in place really only helps me if I'm trying to get ahold of an item that doesn't usually have a listing.

I'd love the idea, it's implementation, however, could have positives and negatives. For example, if more than one person has the item listed as a notification when reaching a certain price, then it's essentially a false notification for everyone except the person who is lucky enough to purchase the item.

Secondly, and this is the more important issue, is accidentally listing an item with a digit or two missing. A lot of vendors could benefit from mispriced items almost immediately, depending on how fast the notifications go out.

Sure it's the fault of the user for mispricing the item in the first place, but I wouldn't want to make it easier to purchase mispriced items. Other than that though, it's a sound idea and a feature I'd likely use from time to time.

I had an idea for this, too: a half-minute lag from the time you put an item up for sale to the time it shows up on the marketplace, just to give yourself that last once-over and be sure it really looks exactly the way you meant it to before anyone can snatch it up mispriced. The only person who would notice the lag would be the seller, and of course there will always be those people who don't look to be sure it's right even then. But to be honest, the new box is much better at showing the "real" price with all the commas before final confirmation already.