Mm, I don't support this on the basis that there's a high possibility that even with a 10 minute timer, sales would be blocked still. People would have to get lucky that they're popping in at the right time to maybe get that item at that price -- then there's the idea that someone might keep putting it in new carts. I suppose you could make a cool down for using it, but that feels like it starts to needlessly complicate things. At least there's the trading forums where you can buy multiple things at once like that.